10. Duration on account of its dependability. 11. Its high practical

efficiency. XIX. EDISON'S POURED CEMENT HOUSE THE inventions that have been thus far described fall into two classes--first, those that were fundamental in the great arts and industries which have been founded and established upon them, and, second, those that have entered into and enlarged other arts that were previously in existence. On coming to consider the subject now under discussion, however, we find ourselves, at this writing, on the threshold of an entirely new and undeveloped art of such boundless possibilities that its ultimate extent can only be a matter of conjecture. Edison's concrete house, however, involves two main considerations, first of which was the conception or creation of the IDEA--vast and comprehensive--of providing imperishable and sanitary homes for the wage-earner by molding an entire house in one piece in a single operation, so to speak, and so simply that extensive groups of such dwellings could be constructed rapidly and at very reasonable cost. With this idea suggested, one might suppose that it would be a simple matter to make molds and pour in a concrete mixture. Not so, however. And here the second consideration presents itself. An ordinary cement mixture is composed of crushed stone, sand, cement, and water. If such a mixture be poured into deep molds the heavy stone and sand settle to the bottom. Should the mixture be poured into a horizontal mold, like the floor of a house, the stone and sand settle, forming an ununiform mass. It was at this point that invention commenced, in order to produce a concrete mixture which would overcome this crucial difficulty. Edison, with characteristic thoroughness, took up a line of investigation, and after a prolonged series of experiments succeeded in inventing a mixture that upon hardening remained uniform throughout its mass. In the beginning of his experimentation he had made the conditions of test very severe by the construction of forms similar to that shown in the sketch below. This consisted of a hollow wooden form of the dimensions indicated. The mixture was to be poured into the hopper until the entire form was filled, such mixture flowing down and along the horizontal legs and up the vertical members. It was to be left until the mixture was hard, and the requirement of the test was that there should be absolute uniformity of mixture and mass throughout. This was finally accomplished, and further invention then proceeded along engineering lines looking toward the devising of a system of molds with which practicable dwellings might be cast. Edison's boldness and breadth of conception are well illustrated in his idea of a poured house, in which he displays his accustomed tendency to reverse accepted methods. In fact, it is this very reversal of usual procedure that renders it difficult for the average mind to instantly grasp the full significance of the principles involved and the results attained. Up to this time we have been accustomed to see the erection of a house begun at the foundation and built up slowly, piece by piece, of solid materials: first the outer frame, then the floors and inner walls, followed by the stairways, and so on up to the putting on of the roof. Hence, it requires a complete rearrangement of mental conceptions to appreciate Edison's proposal to build a house FROM THE TOP DOWNWARD, in a few hours, with a freely flowing material poured into molds, and in a few days to take away the molds and find a complete indestructible sanitary house, including foundation, frame, floors, walls, stairways, chimneys, sanitary arrangements, and roof, with artistic ornamentation inside and out, all in one solid piece, as if it were graven or bored out of a rock. To bring about the accomplishment of a project so extraordinarily broad involves engineering and mechanical conceptions of a high order, and, as we have seen, these have been brought to bear on the subject by Edison, together with an intimate knowledge of compounded materials. The main features of this invention are easily comprehensible with the aid of the following diagrammatic sectional sketch: It should be first understood that the above sketch is in broad outline, without elaboration, merely to illustrate the working principle; and while the upright structure on the right is intended to represent a set of molds in position to form a three-story house, with cellar, no regular details of such a building (such as windows, doors, stairways, etc.) are here shown, as they would only tend to complicate an explanation. It will be noted that there are really two sets of molds, an inside and an outside set, leaving a space between them throughout. Although not shown in the sketch, there is in practice a number of bolts passing through these two sets of molds at various places to hold them together in their relative positions. In the open space between the molds there are placed steel rods for the purpose of reinforcement; while all through the entire structure provision is made for water and steam pipes, gas-pipes and electric-light wires being placed in appropriate positions as the molds are assembled. At the centre of the roof there will be noted a funnel-shaped opening. Into this there is delivered by the endless chain of buckets shown on the left a continuous stream of a special free-flowing concrete mixture. This mixture descends by gravity, and gradually fills the entire space between the two sets of molds. The delivery of the material--or "pouring," as it is called--is continued until every part of the space is filled and the mixture is even with the tip of the roof, thus completing the pouring, or casting, of the house. In a few days afterward the concrete will have hardened sufficiently to allow the molds to be taken away leaving an entire house, from cellar floor to the peak of the roof, complete in all its parts, even to mantels and picture molding, and requiring only windows and doors, plumbing, heating, and lighting fixtures to make it ready for habitation. In the above sketch the concrete mixers, A, B, are driven by the electric motor, C. As the material is mixed it descends into the tank, D, and flows through a trough into a lower tank, E, in which it is constantly stirred, and from which it is taken by the endless chain of buckets and dumped into the funnel-shaped opening at the top of the molds, as above described. The molds are made of cast-iron in sections of such size and weight as will be most convenient for handling, mostly in pieces not exceeding two by four feet in rectangular dimensions. The subjoined sketch shows an exterior view of several of these molds as they appear when bolted together, the intersecting central portions representing ribs, which are included as part of the casting for purposes of strength and rigidity. The molds represented above are those for straight work, such as walls and floors. Those intended for stairways, eaves, cornices, windows, doorways, etc., are much more complicated in design, although the same general principles are employed in their construction. While the philosophy of pouring or casting a complete house in its entirety is apparently quite simple, the development of the engineering and mechanical questions involves the solution of a vast number of most intricate and complicated problems covering not only the building as a whole, but its numerous parts, down to the minutest detail. Safety, convenience, duration, and the practical impossibility of altering a one-piece solid dwelling are questions that must be met before its construction, and therefore Edison has proceeded calmly on his way toward the goal he has ever had clearly in mind, with utter indifference to the criticisms and jeers of those who, as "experts," have professed positive knowledge of the impossibility of his carrying out this daring scheme. LIST OF UNITED STATES PATENTS List of United States patents granted to Thomas A. Edison, arranged according to dates of execution of applications for such patents. This list shows the inventions as Mr. Edison has worked upon them from year to year 1868 NO. TITLE OF PATENT DATE EXECUTED DATE EXECUTED 90,646, Electrographic Vote Recorder . . . . .Oct. 13, 1868 1869 91,527 Printing Telegraph (reissued October 25, 1870, numbered 4166, and August 5, 1873, numbered 5519). . . . . . . .Jan. 25, 1869 96,567 Apparatus for Printing Telegraph (reissued February 1, 1870, numbered 3820). . . . . . . . . . . . . . . . .Aug. 17, 1869 96,681 Electrical Switch for Telegraph Apparatus Aug. 27, 1869 102,320 Printing Telegraph--Pope and Edison (reissued April 17, 1877, numbered 7621, and December 9, 1884, numbered 10,542). . . . . . . . . . . . . . . Sept. 16, 1869 103,924 Printing Telegraphs--Pope and Edison (reissued August 5, 1873) 1870 103,035 Electromotor Escapement. . . . . . . . Feb. 5, 1870 128,608 Printing Telegraph Instruments . . . . .May 4, 1870 114,656 Telegraph Transmitting Instruments . .June 22, 1870 114,658 Electro Magnets for Telegraph Instruments. . . . . . . . . . . . . .June 22, 1870 114,657 Relay Magnets for Telegraph Instruments. . . . . . . . . . . . . .Sept. 6, 1870 111,112 Electric Motor Governors . . . . . . .June 29, 1870 113,033 Printing Telegraph Apparatus . . . . .Nov. 17, 1870 1871 113,034 Printing Telegraph Apparatus . . . . .Jan. 10, 1871 123,005 Telegraph Apparatus. . . . . . . . . .July 26, 1871 123,006 Printing Telegraph . . . . . . . . . .July 26, 1871 123,984 Telegraph Apparatus. . . . . . . . . .July 26, 1871 124,800 Telegraphic Recording Instruments. . .Aug. 12, 1871 121,601 Machinery for Perforating Paper for Telegraph Purposes . . . . . . . . . .Aug. 16, 1871 126,535 Printing Telegraphs. . . . . . . . . .Nov. 13, 1871 133,841 Typewriting Machine. . . . . . . . . .Nov. 13, 1871 1872 126,532 Printing Telegraphs. . . . . . . . . . .Jan. 3 1872 126,531 Printing Telegraphs. . . . . . . . . .Jan. 17, 1872 126,534 Printing Telegraphs. . . . . . . . . .Jan. 17, 1872 126,528 Type Wheels for Printing Telegraphs. .Jan. 23, 1872 126,529 Type Wheels for Printing Telegraphs. .Jan. 23, 1872 126,530 Printing Telegraphs. . . . . . . . . .Feb. 14, 1872 126,533 Printing Telegraphs. . . . . . . . . .Feb. 14, 1872 132,456 Apparatus for Perforating Paper for Telegraphic Use. . . . . . . . . . . March 15, 1872 132,455 Improvement in Paper for Chemical Telegraphs . . . . . . . . . . . . . April 10, 1872 133,019 Electrical Printing Machine. . . . . April 18, 1872 128,131 Printing Telegraphs. . . . . . . . . April 26, 1872 128,604 Printing Telegraphs. . . . . . . . . April 26, 1872 128,605 Printing Telegraphs. . . . . . . . . April 26, 1872 128,606 Printing Telegraphs. . . . . . . . . April 26, 1872 128,607 Printing Telegraphs. . . . . . . . . April 26, 1872 131,334 Rheotomes or Circuit Directors . . . . .May 6, 1872 134,867 Automatic Telegraph Instruments. . . . .May 8, 1872 134,868 Electro Magnetic Adjusters . . . . . . .May 8, 1872 130,795 Electro Magnets. . . . . . . . . . . . .May 9, 1872 131,342 Printing Telegraphs. . . . . . . . . . .May 9, 1872 131,341 Printing Telegraphs. . . . . . . . . . May 28, 1872 131,337 Printing Telegraphs. . . . . . . . . .June 10, 1872 131,340 Printing Telegraphs. . . . . . . . . .June 10, 1872 131,343 Transmitters and Circuits for Printing Telegraph. . . . . . . . . . . . . . .June 10, 1872 131,335 Printing Telegraphs. . . . . . . . . .June 15, 1872 131,336 Printing Telegraphs. . . . . . . . . .June 15, 1872 131,338 Printing Telegraphs. . . . . . . . . .June 29, 1872 131,339 Printing Telegraphs. . . . . . . . . .June 29, 1872 131,344 Unison Stops for Printing Telegraphs .June 29, 1872 134,866 Printing and Telegraph Instruments . .Oct. 16, 1872 138,869 Printing Telegraphs. . . . . . . . . .Oct. 16, 1872 142,999 Galvanic Batteries . . . . . . . . . .Oct. 31, 1872 141,772 Automatic or Chemical Telegraphs . . . Nov. 5, 1872 135,531 Circuits for Chemical Telegraphs . . . Nov. 9, 1872 146,812 Telegraph Signal Boxes . . . . . . . .Nov. 26, 1872 141,773 Circuits for Automatic Telegraphs. . .Dec. 12, 1872 141,776 Circuits for Automatic Telegraphs. . .Dec. 12, 1872 150,848 Chemical or Automatic Telegraphs . . .Dec. 12, 1872 1873 139,128 Printing Telegraphs. . . . . . . . . .Jan. 21, 1873 139,129 Printing Telegraphs. . . . . . . . . .Feb. 13, 1873 140,487 Printing Telegraphs. . . . . . . . . .Feb. 13, 1873 140,489 Printing Telegraphs. . . . . . . . . .Feb. 13, 1873 138,870 Printing Telegraphs. . . . . . . . . .March 7, 1873 141,774 Chemical Telegraphs. . . . . . . . . .March 7, 1873 141,775 Perforator for Automatic Telegraphs. .March 7, 1873 141,777 Relay Magnets. . . . . . . . . . . . .March 7, 1873 142,688 Electric Regulators for Transmitting Instruments . . . . . . . . . . . . . .March 7, 1873 156,843 Duplex Chemical Telegraphs . . . . . .March 7, 1873 147,312 Perforators for Automatic Telegraphy March 24, 1873 147,314 Circuits for Chemical Telegraphs . . March 24, 1873 150,847 Receiving Instruments for Chemical Telegraphs . . . . . . . . . . . . . March 24, 1873 140,488 Printing Telegraphs. . . . . . . . . April 23, 1873 147,311 Electric Telegraphs. . . . . . . . . April 23, 1873 147,313 Chemical Telegraphs. . . . . . . . . April 23, 1873 147,917 Duplex Telegraphs. . . . . . . . . . April 23, 1873 150,846 Telegraph Relays . . . . . . . . . . April 23, 1873 160,405 Adjustable Electro Magnets for Relays, etc. . . . . . . . . . . . . April 23, 1873 162,633 Duplex Telegraphs. . . . . . . . . . April 22, 1873 151,209 Automatic Telegraphy and Perforators Therefor . . . . . . . . . . . . . . .Aug. 25, 1873 160,402 Solutions for Chemical Telegraph PaperSept. 29, 1873 160,404 Solutions for Chemical Telegraph PaperSept. 29, 1873 160,580 Solutions for Chemical Telegraph PaperOct. 14, 1873 160,403 Solutions for Chemical Telegraph PaperOct. 29, 1873 1874 154,788 District Telegraph Signal Box. . . . .April 2, 1874 168,004 Printing Telegraph . . . . . . . . . . May 22, 1874 166,859 Chemical Telegraphy. . . . . . . . . . June 1, 1874 166,860 Chemical Telegraphy. . . . . . . . . . June 1, 1874 166,861 Chemical Telegraphy. . . . . . . . . . June 1, 1874 158,787 Telegraph Apparatus. . . . . . . . . . Aug. 7, 1874 172,305 Automatic Roman Character Telegraph. . . . . . . . . . . . . . . Aug. 7, 1874 173,718 Automatic Telegraphy . . . . . . . . . Aug. 7, 1874 178,221 Duplex Telegraphs. . . . . . . . Aug. 19, 1874 178,222 Duplex Telegraphs. . . . . . . . . . .Aug. 19, 1874 178,223 Duplex Telegraphs. . . . . . . . . . .Aug. 19, 1874 180,858 Duplex Telegraphs. . . . . . . . . . .Aug. 19, 1874 207,723 Duplex Telegraphs. . . . . . . . . . .Aug. 19, 1874 480,567 Duplex Telegraphs. . . . . . . . . . .Aug. 19, 1874 207,724 Duplex Telegraphs. . . . . . . . . . .Dec. 14, 1874 1875 168,242 Transmitter and Receiver for Automatic Telegraph. . . . . . . . . . . . . . .Jan. 18, 1875 168,243 Automatic Telegraphs . . . . . . . . .Jan. 18, 1875 168,385 Duplex Telegraphs. . . . . . . . . . .Jan. 18, 1875 168,466 Solution for Chemical Telegraphs . . .Jan. 18, 1875 168,467 Recording Point for Chemical Telegraph Jan. 18, 1875 195,751 Automatic Telegraphs . . . . . . . . . Jan. 18 1875 195,752 Automatic Telegraphs . . . . . . . . .Jan. 19, 1875 171,273 Telegraph Apparatus. . . . . . . . . . Feb 11, 1875 169,972 Electric Signalling Instrument . . . . Feb 24, 1875 209,241 Quadruplex Telegraph Repeaters (reissued September 23, 1879, numbered 8906). . . . . . . . . . . . . . . . . Feb 24, 1875 1876 180,857 Autographic Printing . . . . . . . . .March 7, 1876 198,088 Telephonic Telegraphs. . . . . . . . .April 3, 1876 198,089 Telephonic or Electro Harmonic Telegraphs . . . . . . . . . . . . . .April 3, 1876 182,996 Acoustic Telegraphs. . . . . . . . . . .May 9, 1876 186,330 Acoustic Electric Telegraphs . . . . . .May 9, 1876 186,548 Telegraph Alarm and Signal Apparatus . .May 9, 1876 198,087 Telephonic Telegraphs. . . . . . . . . .May 9, 1876 185,507 Electro Harmonic Multiplex Telegraph .Aug. 16, 1876 200,993 Acoustic Telegraph . . . . . . . . . .Aug. 26, 1876 235,142 Acoustic Telegraph . . . . . . . . . .Aug. 26, 1876 200,032 Synchronous Movements for Electric Telegraphs . . . . . . . . . . . . . .Oct. 30, 1876 200,994 Automatic Telegraph Perforator and Transmitter. . . . . . . . . . . . . .Oct. 30, 1876 1877 205,370 Pneumatic Stencil Pens . . . . . . . . Feb. 3, 1877 213,554 Automatic Telegraphs . . . . . . . . . Feb. 3, 1877 196,747 Stencil Pens . . . . . . . . . . . . April 18, 1877 203,329 Perforating Pens . . . . . . . . . . April 18, 1877 474,230 Speaking Telegraph . . . . . . . . . April 18, 1877 217,781 Sextuplex Telegraph. . . . . . . . . . .May 8, 1877 230,621 Addressing Machine . . . . . . . . . . .May 8, 1877 377,374 Telegraphy . . . . . . . . . . . . . . .May 8, 1877 453,601 Sextuplex Telegraph. . . . . . . . . . May 31, 1877 452,913 Sextuplex Telegraph. . . . . . . . . . May 31, 1877 512,872 Sextuplex Telegraph. . . . . . . . . . May 31, 1877 474,231 Speaking Telegraph . . . . . . . . . . July 9, 1877 203,014 Speaking Telegraph . . . . . . . . . .July 16, 1877 208,299 Speaking Telegraph . . . . . . . . . .July 16, 1877 203,015 Speaking Telegraph . . . . . . . . . .Aug. 16, 1877 420,594 Quadruplex Telegraph . . . . . . . . .Aug. 16, 1877 492,789 Speaking Telegraph . . . . . . . . . .Aug. 31, 1877 203,013 Speaking Telegraph . . . . . . . . . . Dec. 8, 1877 203 018 Telephone or Speaking Telegraph. . . . Dec. 8, 1877 200 521 Phonograph or Speaking Machine . . . .Dec. 15, 1877 1878 203,019 Circuit for Acoustic or Telephonic Telegraphs . . . . . . . . . . . . . .Feb. 13, 1878 201,760 Speaking Machines. . . . . . . . . . .Feb. 28, 1878 203,016 Speaking Machines. . . . . . . . . . .Feb. 28, 1878 203,017 Telephone Call Signals . . . . . . . .Feb. 28, 1878 214,636 Electric Lights. . . . . . . . . . . . Oct. 5, 1878 222,390 Carbon Telephones. . . . . . . . . . . Nov. 8, 1878 217,782 Duplex Telegraphs. . . . . . . . . . .Nov. 11, 1878 214,637 Thermal Regulator for Electric Lights.Nov. 14, 1878 210,767 Vocal Engines. . . . . . . . . . . . .Aug. 31, 1878 218,166 Magneto Electric Machines. . . . . . . Dec. 3, 1878 218,866 Electric Lighting Apparatus. . . . . . Dec. 3, 1878 219,628 Electric Lights. . . . . . . . . . . . Dec. 3, 1878 295,990 Typewriter . . . . . . . . . . . . . . Dec. 4, 1878 218,167 Electric Lights. . . . . . . . . . . .Dec. 31, 1878 1879 224,329 Electric Lighting Apparatus. . . . . .Jan. 23, 1879 227,229 Electric Lights. . . . . . . . . . . .Jan. 28, 1879 227,227 Electric Lights. . . . . . . . . . . . Feb. 6, 1879 224.665 Autographic Stencils for Printing. . March 10, 1879 227.679 Phonograph . . . . . . . . . . . . . March 19, 1879 221,957 Telephone. . . . . . . . . . . . . . March 24, 1879 227,229 Electric Lights. . . . . . . . . . . April 12, 1879 264,643 Magneto Electric Machines. . . . . . April 21, 1879 219,393 Dynamo Electric Machines . . . . . . . July 7, 1879 231,704 Electro Chemical Receiving Telephone .July 17, 1879 266,022 Telephone. . . . . . . . . . . . . . . Aug. 1, 1879 252,442 Telephone. . . . . . . . . . . . . . . Aug. 4, 1879 222,881 Magneto Electric Machines. . . . . . .Sept. 4, 1879 223,898 Electric Lamp. . . . . . . . . . . . . Nov. 1, 1879 1880 230,255 Electric Lamps . . . . . . . . . . . .Jan. 28, 1880 248,425 Apparatus for Producing High Vacuums Jan.28 1880 265,311 Electric Lamp and Holder for Same. . . Jan. 28 1880 369,280 System of Electrical Distribution. . .Jan. 28, 1880 227,226 Safety Conductor for Electric Lights .March 10,1880 228,617 Brake for Electro Magnetic Motors. . March 10, 1880 251,545 Electric Meter . . . . . . . . . . . March 10, 1880 525,888 Manufacture of Carbons for Electric Lamps. . . . . . . . . . . . . . . . March 10, 1880 264,649 Dynamo or Magneto Electric Machines. March 11, 1880 228,329 Magnetic Ore Separator . . . . . . . .April 3, 1880 238,868 Manufacture of Carbons for Incandescent Electric Lamps . . . . . . . . . . . April 25, 1880 237,732 Electric Light . . . . . . . . . . . .June 15, 1880 248,417 Manufacturing Carbons for Electric Lights . . . . . . . . . . . . . . . .June 15, 1880 298,679 Treating Carbons for Electric Lights .June 15, 1880 248,430 Electro Magnetic Brake . . . . . . . . July 2, 1880 265,778 Electro Magnetic Railway Engine. . . . July 3, 1880 248,432 Magnetic Separator . . . . . . . . . .July 26, 1880 239,150 Electric Lamp. . . . . . . . . . . . .July 27, 1880 239,372 Testing Electric Light Carbons--Edison and Batchelor. . . . . . . . . . . . .July 28, 1880 251,540 Carbon Electric Lamps. . . . . . . . .July 28, 1880 263,139 Manufacture of Carbons for Electric Lamps. . . . . . . . . . . . . . . . .July 28, 1880 434,585 Telegraph Relay. . . . . . . . . . . .July 29, 1880 248 423 Carbonizer . . . . . . . . . . . . . .July 30, 1880 263 140 Dynamo Electric Machines . . . . . . .July 30, 1880 248,434 Governor for Electric Engines. . . . .July 31, 1880 239,147 System of Electric Lighting. . . . . .July 31, 1880 264,642 Electric Distribution and Translation System . . . . . . . . . . . . . . . . Aug. 4, 1880 293,433 Insulation of Railroad Tracks used for Electric Circuits. . . . . . . . . . . Aug. 6, 1880 239,373 Electric Lamp. . . . . . . . . . . . . Aug. 7, 1880 239,745 Electric Lamp. . . . . . . . . . . . . Aug. 7, 1880 263,135 Electric Lamp. . . . . . . . . . . . . Aug. 7, 1880 251,546 Electric Lamp. . . . . . . . . . . . .Aug. 10, 1880 239,153 Electric Lamp. . . . . . . . . . . . .Aug. 11, 1880 351,855 Electric Lamp. . . . . . . . . . . . .Aug. 11, 1880 248,435 Utilizing Electricity as Motive Power.Aug. 12, 1880 263,132 Electro Magnetic Roller. . . . . . . .Aug. 14, 1880 264,645 System of Conductors for the Distribution of Electricity . . . . . . . . . . . .Sept. 1, 1880 240,678 Webermeter . . . . . . . . . . . . . Sept. 22, 1880 239,152 System of Electric Lighting. . . . . .Oct. 14, 1880 239,148 Treating Carbons for Electric Lights .Oct. 15, 1880 238,098 Magneto Signalling Apparatus--Edison and Johnson. . . . . . . . . . . . . .Oct. 21, 1880 242,900 Manufacturing Carbons for Electric Lamps. . . . . . . . . . . . . . . . .Oct. 21, 1880 251,556 Regulator for Magneto or Dynamo Electric Machines. . . . . . . . . . .Oct. 21, 1880 248,426 Apparatus for Treating Carbons for Electric Lamps . . . . . . . . . . . . Nov. 5, 1880 239,151 Forming Enlarged Ends on Carbon Filaments. . . . . . . . . . . . . . .Nov. 19, 1880 12,631 Design Patent--Incandescent Electric Lamp . . . . . . . . . . . . . . . . .Nov. 23, 1880 239,149 Incandescing Electric Lamp . . . . . . Dec. 3, 1880 242,896 Incandescent Electric Lamp . . . . . . Dec. 3, 1880 242,897 Incandescent Electric Lamp . . . . . . Dec. 3, 1880 248,565 Webermeter . . . . . . . . . . . . . . Dec. 3, 1880 263,878 Electric Lamp. . . . . . . . . . . . . Dec. 3, 1880 239,154 Relay for Telegraphs . . . . . . . . .Dec. 11, 1880 242,898 Dynamo Electric Machine. . . . . . . .Dec. 11, 1880 248,431 Preserving Fruit . . . . . . . . . . .Dec. 11, 1880 265,777 Treating Carbons for Electric Lamps. .Dec. 11, 1880 239,374 Regulating the Generation of Electric Currents . . . . . . . . . . . . . . .Dec. 16, 1880 248,428 Manufacture of Incandescent Electric Lamps. . . . . . . . . . . . . . . . .Dec. 16, 1880 248,427 Apparatus for Treating Carbons for Electric Lamps . . . . . . . . . . . .Dec. 21, 1880 248,437 Apparatus for Treating Carbons for Electric Lamps . . . . . . . . . . . .Dec. 21, 1880 248,416 Manufacture of Carbons for Electric Lights . . . . . . . . . . . . . . . .Dec. 30, 1880 1881 242,899 Electric Lighting. . . . . . . . . . .Jan. 19, 1881 248,418 Electric Lamp. . . . . . . . . . . . . Jan. 19 1881 248,433 Vacuum Apparatus . . . . . . . . . . . Jan. 19 1881 251,548 Incandescent Electric Lamps. . . . . .Jan. 19, 1881 406,824 Electric Meter . . . . . . . . . . . .Jan. 19, 1881 248,422 System of Electric Lighting. . . . . .Jan. 20, 1881 431,018 Dynamo or Magneto Electric Machine . . Feb. 3, 1881 242,901 Electric Motor . . . . . . . . . . . .Feb. 24, 1881 248,429 Electric Motor . . . . . . . . . . . .Feb. 24, 1881 248,421 Current Regulator for Dynamo Electric Machine. . . . . . . . . . . . . . . .Feb. 25, 1881 251,550 Magneto or Dynamo Electric Machines. .Feb. 26, 1881 251,555 Regulator for Dynamo Electric Machines . . . . . . . . . . . . . . .Feb. 26, 1881 482,549 Means for Controlling Electric Generation . . . . . . . . . . . . . .March 2, 1881 248,420 Fixture and Attachment for Electric Lamps. . . . . . . . . . . . . . . . .March 7, 1881 251,553 Electric Chandeliers . . . . . . . . .March 7, 1881 251,554 Electric Lamp and Socket or Holder . .March 7, 1881 248,424 Fitting and Fixtures for Electric Lamps. . . . . . . . . . . . . . . . .March 8, 1881 248,419 Electric Lamp. . . . . . . . . . . . March 30, 1881 251,542 System of Electric Light . . . . . . April 19, 1881 263,145 Making Incandescents . . . . . . . . April 19, 1881 266,447 Electric Incandescent Lamp . . . . . April 21, 1881 251,552 Underground Conductors . . . . . . . April 22, 1881 476,531 Electric Lighting System . . . . . . April 22, 1881 248,436 Depositing Cell for Plating the Connections of Electric Lamps. . . . . . . . . . . May 17, 1881 251,539 Electric Lamp. . . . . . . . . . . . . May 17, 1881 263,136 Regulator for Dynamo or Magneto Electric Machine . . . . . . . . . . . May 17, 1881 251,557 Webermeter . . . . . . . . . . . . . . May 19, 1881 263,134 Regulator for Magneto Electric Machine. . . . . . . . . . . . . . . . May 19, 1881 251,541 Electro Magnetic Motor . . . . . . . . May 20, 1881 251,544 Manufacture of Electric Lamps. . . . . May 20, 1881 251,549 Electric Lamp and the Manufacture thereof. . . . . . . . . . . . . . . . May 20, 1881 251,558 Webermeter . . . . . . . . . . . . . . May 20, 1881 341,644 Incandescent Electric Lamp . . . . . . May 20, 1881 251,551 System of Electric Lighting. . . . . . May 21, 1881 263,137 Electric Chandelier. . . . . . . . . . May 21, 1881 263,141 Straightening Carbons for Incandescent Lamps. . . . . . . . . . . . . . . . . May 21, 1881 264,657 Incandescent Electric Lamps. . . . . . May 21, 1881 251,543 Electric Lamp. . . . . . . . . . . . . May 24, 1881 251,538 Electric Light . . . . . . . . . . . . May 27, 1881 425,760 Measurement of Electricity in Distribution System . . . . . . . . . . . . . . . .May 3 1, 1881 251,547 Electrical Governor. . . . . . . . . . June 2, 1881 263,150 Magneto or Dynamo Electric Machines. June 3, 1881 263,131 Magnetic Ore Separator . . . . . . . . June 4, 1881 435,687 Means for Charging and Using Secondary Batteries. . . . . . . . . . . . . . .June 21, 1881 263,143 Magneto or Dynamo Electric Machines. .June 24, 1881 251,537 Dynamo Electric Machine. . . . . . . .June 25, 1881 263,147 Vacuum Apparatus . . . . . . . . . . .July 1, 188 1 439,389 Electric Lighting System . . . . . . . July 1, 1881 263,149 Commutator for Dynamo or Magneto Electric Machines. . . . . . . . . . .July 22, 1881 479,184 Facsimile Telegraph--Edison and Kenny.July 26, 1881 400,317 Ore Separator. . . . . . . . . . . . .Aug. 11, 1881 425,763 Commutator for Dynamo Electric Machines . . . . . . . . . . . . . . .Aug. 20, 1881 263,133 Dynamo or Magneto Electric Machine . .Aug. 24, 1881 263,142 Electrical Distribution System . . . .Aug. 24, 1881 264,647 Dynamo or Magneto Electric Machines. .Aug. 24, 1881 404,902 Electrical Distribution System . . . .Aug. 24, 1881 257,677 Telephone. . . . . . . . . . . . . . .Sept. 7, 1881 266,021 Telephone. . . . . . . . . . . . . . .Sept. 7, 1881 263,144 Mold for Carbonizing Incandescents . Sept. 19, 1881 265,774 Maintaining Temperatures in Webermeters. . . . . . . . . . . . . Sept. 21, 1881 264,648 Dynamo or Magneto Electric Machines. Sept. 23, 1881 265,776 Electric Lighting System . . . . . . Sept. 27, 1881 524,136 Regulator for Dynamo Electrical Machines . . . . . . . . . . . . . . Sept. 27, 1881 273,715 Malleableizing Iron. . . . . . . . . . Oct. 4, 1881 281,352 Webermeter . . . . . . . . . . . . . . Oct. 5, 1881 446,667 Locomotives for Electric Railways. . .Oct. 11, 1881 288,318 Regulator for Dynamo or Magneto Electric Machines. . . . . . . . . . .Oct. 17, 1881 263,148 Dynamo or Magneto Electric Machines. Oct. 25, 1881 264,646 Dynamo or Magneto Electric Machines. Oct. 25, 1881 251,559 Electrical Drop Light. . . . . . . . .Oct. 25, 1881 266,793 Electric Distribution System . . . . .Oct. 25, 1881 358,599 Incandescent Electric Lamp . . . . . .Oct. 29, 1881 264,673 Regulator for Dynamo Electric Machine. Nov. 3, 1881 263,138 Electric Arc Light . . . . . . . . . . Nov. 7, 1881 265,775 Electric Arc Light . . . . . . . . . . .Nov. 7 1881 297,580 Electric Arc Light . . . . . . . . . . .Nov. 7 1881 263,146 Dynamo Magneto Electric Machines . . .Nov. 22, 1881 266,588 Vacuum Apparatus . . . . . . . . . . .Nov. 25, 1881 251,536 Vacuum Pump. . . . . . . . . . . . . . Dec. 5, 1881 264,650 Manufacturing Incandescent Electric Lamps. . . . . . . . . . . . . . . . . Dec. 5, 1881 264,660 Regulator for Dynamo Electric Machines . . . . . . . . . . . . . . . Dec. 5, 1881 379,770 Incandescent Electric Lamp . . . . . . Dec. 5, 1881 293,434 Incandescent Electric Lamp . . . . . . Dec. 5, 1881 439,391 Junction Box for Electric Wires. . . . Dec. 5, 1881 454,558 Incandescent Electric Lamp . . . . . . Dec. 5, 1881 264,653 Incandescent Electric Lamp . . . . . .Dec. 13, 1881 358,600 Incandescing Electric Lamp . . . . . .Dec. 13, 1881 264,652 Incandescent Electric Lamp . . . . . .Dec. 15, 1881 278,419 Dynamo Electric Machines . . . . . . .Dec. 15, 1881 1882 265,779 Regulator for Dynamo Electric Machines . . . . . . . . . . . . . . .Jan. 17, 1882 264,654 Incandescent Electric Lamps. . . . . .Feb. 10, 1882 264,661 Regulator for Dynamo Electric Machines Feb. 10, 1882 264,664 Regulator for Dynamo Electric Machines Feb. 10, 1882 264,668 Regulator for Dynamo Electric Machines Feb. 10, 1882 264,669 Regulator for Dynamo Electric Machines . . . . . . . . . . . . . . .Feb. 10, 1882 264,671 Regulator for Dynamo Electric Machines . . . . . . . . . . . . . . .Feb. 10, 1882 275,613 Incandescing Electric Lamp . . . . . .Feb. 10, 1882 401,646 Incandescing Electric Lamp . . . . . .Feb. 10, 1882 264,658 Regulator for Dynamo Electric Machines . . . . . . . . . . . . . . .Feb. 28, 1882 264,659 Regulator for Dynamo Electric Machines . . . . . . . . . . . . . . .Feb. 28, 1882 265,780 Regulator for Dynamo Electric Machines . . . . . . . . . . . . . . .Feb. 28, 1882 265,781 Regulator for Dynamo Electric Machines . . . . . . . . . . . . . . .Feb. 28, 1882 278,416 Manufacture of Incandescent Electric Lamps. . . . . . . . . . . . . . . . .Feb. 28, 1882 379,771 Regulator for Dynamo Electric Machines . . . . . . . . . . . . . . .Feb. 28, 1882 272,034 Telephone. . . . . . . . . . . . . . March 30, 1882 274,576 Transmitting Telephone . . . . . . . March 30, 1882 274,577 Telephone. . . . . . . . . . . . . . March 30, 1882 264,662 Regulator for Dynamo Electric Machines . . . . . . . . . . . . . . . .May 1, 1882 264,663 Regulator for Dynamo Electric Machines . . . . . . . . . . . . . . . .May 1, 1882 264,665 Regulator for Dynamo Electric Machines . . . . . . . . . . . . . . . .May 1, 1882 264,666 Regulator for Dynamo Electric Machines . . . . . . . . . . . . . . . .May 1, 1882 268,205 Dynamo or Magneto Electric Machine. . . . . . . . . . . . . . . . .May 1, 1882 273,488 Regulator for Dynamo Electric Machines . . . . . . . . . . . . . . . .May 1, 1882 273,492 Secondary Battery. . . . . . . . . . . May 19, 1882 460,122 Process of and Apparatus for Generating Electricity . . . . . . . . May 19, 1882 466,460 Electrolytic Decomposition . . . . . .May 19,. 1882 264,672 Regulator for Dynamo Electric Machines . . . . . . . . . . . . . . . May 22, 1882 264,667 Regulator for Dynamo Electric Machines . . . . . . . . . . . . . . . May 22, 1882 265,786 Apparatus for Electrical Transmission of Power . . . . . . . . . . . . . . . May 22, 1882 273,828 System of Underground Conductors of Electric Distribution. . . . . . . . . May 22, 1882 379,772 System of Electrical Distribution. . . May 22, 1882 274,292 Secondary Battery. . . . . . . . . . . June 3, 1882 281,353 Dynamo or Magneto Electric Machine . . June 3, 1882 287,523 Dynamo or Magneto Electric Machine . . June 3, 1882 365,509 Filament for Incandescent Electric Lamps. . . . . . . . . . . . . . . . . .June 3 1882 446,668 Electric Are Light . . . . . . . . . . .June 3 1882 543,985 Incandescent Conductor for Electric Lamps. . . . . . . . . . . . . . . . . June 3, 1882 264,651 Incandescent Electric Lamps. . . . . . June 9, 1882 264,655 Incandescing Electric Lamps. . . . . . June 9, 1882 264,670 Regulator for Dynamo Electric Machines . . . . . . . . . . . . . . . June 9, 1882 273,489 Turn-Table for Electric Railway. . . . June 9, 1882 273,490 Electro Magnetic Railway System. . . . June 9, 1882 401,486 System of Electric Lighting. . . . . .June 12, 1882 476,527 System of Electric Lighting. . . . . .June 12, 1882 439,390 Electric Lighting System . . . . . . .June 19, 1882 446,666 System of Electric Lighting. . . . . .June 19, 1882 464,822 System of Distributing Electricity . .June 19, 1882 304,082 Electrical Meter . . . . . . . . . . .June 24, 1882 274,296 Manufacture of Incandescents . . . . . July 5, 1882 264,656 Incandescent Electric Lamp . . . . . . July 7, 1882 265,782 Regulator for Dynamo Electric Machines July 7, 1882 265,783 Regulator for Dynamo Electric Machines July 7, 1882 265,784 Regulator for Dynamo Electric Machines July 7, 1882 265,785 Dynamo Electric Machine. . . . . . . . July 7, 1882 273,494 Electrical Railroad. . . . . . . . . . July 7, 1882 278,418 Translating Electric Currents from High to Low Tension . . . . . . . . . . . . July 7, 1882 293,435 Electrical Meter . . . . . . . . . . . July 7, 1882 334,853 Mold for Carbonizing . . . . . . . . . July 7, 1882 339,278 Electric Railway . . . . . . . . . . . July 7, 1882 273,714 Magnetic Electric Signalling Apparatus. . . . . . . . . . . . . . . Aug. 5, 1882 282,287 Magnetic Electric Signalling Apparatus. . . . . . . . . . . . . . . Aug. 5, 1882 448,778 Electric Railway . . . . . . . . . . . Aug. 5, 1882 439,392 Electric Lighting System . . . . . . .Aug. 12, 1882 271,613 Manufacture of Incandescent Electric Lamps. . . . . . . . . . . . . . . . .Aug. 25, 1882 287,518 Manufacture of Incandescent Electric Lamps. . . . . . . . . . . . . . . . .Aug. 25, 1882 406,825 Electric Meter . . . . . . . . . . . .Aug. 25, 1882 439,393 Carbonizing Chamber. . . . . . . . . .Aug. 25, 1882 273,487 Regulator for Dynamo Electric Machines Sept. 12, 1882 297,581 Incandescent Electric Lamp . . . . . Sept. 12, 1882 395,962 Manufacturing Electric Lamps . . . . Sept. 16, 1882 287,525 Regulator for Systems of Electrical Distribution--Edison and C. L. Clarke . . . . . . . . . . . . . . . . Oct. 4, 1882 365,465 Valve Gear . . . . . . . . . . . . . . Oct. 5, 1882 317,631 Incandescent Electric Lamp . . . . . . Oct. 7, 1882 307,029 Filament for Incandescent Lamp . . . . Oct. 9, 1882 268,206 Incandescing Electric Lamp . . . . . .Oct. 10, 1882 273,486 Incandescing Electric Lamp . . . . . .Oct. 12, 1882 274,293 Electric Lamp. . . . . . . . . . . . .Oct. 14, 1882 275,612 Manufacture of Incandescent Electric Lamps. . . . . . . . . . . . . . . . .Oct. 14, 1882 430,932 Manufacture of Incandescent Electric Lamps. . . . . . . . . . . . . . . . .Oct. 14, 1882 271,616 Regulator for Dynamo Electric Machines . . . . . . . . . . . . . . .Oct. 16, 1882 543,986 Process for Treating Products Derived from Vegetable Fibres. . . . . . . . .Oct. 17, 1882 543,987 Filament for Incandescent Lamps. . . .Oct. 17, 1882 271,614 Shafting . . . . . . . . . . . . . . .Oct. 19, 1882 271,615 Governor for Dynamo Electric Machines . . . . . . . . . . . . . . .Oct. 19, 1882 273,491 Regulator for Driving Engines of Electrical Generators. . . . . . . . .Oct. 19, 1882 273,493 Valve Gear for Electrical Generator Engines. . . . . . . . . . . . . . . .Oct. 19, 1882 411,016 Manufacturing Carbon Filaments . . . .Oct. 19, 1882 492,150 Coating Conductors for Incandescent Lamps. . . . . . . . . . . . . . . . .Oct. 19, 1882 273,485 Incandescent Electric Lamps. . . . . .Oct. 26, 1882 317,632 Incandescent Electric Lamps. . . . . .Oct. 26, 1882 317,633 Incandescent Electric Lamps. . . . . .Oct. 26, 1882 287,520 Incandescing Conductor for Electric Lamps. . . . . . . . . . . . . . . . . Nov. 3, 1882 353,783 Incandescent Electric Lamp . . . . . . Nov. 3, 1882 430,933 Filament for Incandescent Lamps. . . . Nov. 3, 1882 274,294 Incandescent Electric Lamp . . . . . .Nov. 13, 1882 281,350 Regulator for Dynamo Electric Machines . . . . . . . . . . . . . . .Nov. 13, 1882 274,295 Incandescent Electric Lamp . . . . . .Nov. 14, 1882 276,233 Electrical Generator and Motor . . . .Nov. 14, 1882 274,290 System of Electrical Distribution. . .Nov. 20, 1882 274,291 Mold for Carbonizer. . . . . . . . . .Nov. 28, 1882 278,413 Regulator for Dynamo Electric MachinesNov. 28, 1882 278,414 Regulator for Dynamo Electric Machines . . . . . . . . . . . . . . .Nov. 28, 1882 287,519 Manufacturing Incandescing Electric Lamps. . . . . . . . . . . . . . . . .Nov. 28, 1882 287,524 Regulator for Dynamo Electric Machines . . . . . . . . . . . . . . .Nov. 28, 1882 438,298 Manufacture of Incandescent Electric Lamps. . . . . . . . . . . . . . . . .Nov. 28, 1882 276,232 Operating and Regulating Electrical Generators . . . . . . . . . . . . . .Dec. 20, 1882 1883 278,415 Manufacture of Incandescent Electric Lamps. . . . . . . . . . . . . . . . .Jan. 13, 1883 278,417 Manufacture of Incandescent Electric Lamps. . . . . . . . . . . . . . . . .Jan. 13, 1883 281,349 Regulator for Dynamo Electric Machines . . . . . . . . . . . . . . .Jan. 13, 1883 283,985 System of Electrical Distribution. . . Jan. 13 1883 283,986 System o' Electrical Distribution. . . Jan. 13 1883 459,835 Manufacture of Incandescent Electric Lamps. . . . . . . . . . . . . . . . .Jan. 13, 1883 13,940 Design Patent--Incandescing Electric Lamp . . . . . . . . . . . . . . . . . Feb. 13 1883 280,727 System of Electrical Distribution. . . Feb. 13 1883 395,123 Circuit Controller for Dynamo Machine.Feb. 13, 1883 287,521 Dynamo or Magneto Electric Machine . .Feb. 17, 1883 287,522 Molds for Carbonizing. . . . . . . . .Feb. 17, 1883 438,299 Manufacture of Carbon Filaments. . . .Feb. 17, 1883 446,669 Manufacture of Filaments for Incandescent Electric Lamps . . . . . . . . . . . .Feb. 17, 1883 476,528 Incandescent Electric Lamp . . . . . .Feb. 17, 1883 281,351 Electrical Generator . . . . . . . . .March 5, 1883 283,984 System of Electrical Distribution. . .March 5, 1883 287,517 System of Electrical Distribution. . .March 14,1883 283,983 System of Electrical Distribution. . .April 5, 1883 354,310 Manufacture of Carbon Conductors . . .April 6, 1883 370,123 Electric Meter . . . . . . . . . . . .April 6, 1883 411,017 Carbonizing Flask. . . . . . . . . . .April 6, 1883 370,124 Manufacture of Filament for Incandescing Electric Lamp. . . . . . . . . . . . April 12, 1883 287,516 System of Electrical Distribution. . . .May 8, 1883 341,839 Incandescent Electric Lamp . . . . . . .May 8, 1883 398,774 Incandescent Electric Lamp . . . . . . .May 8, 1883 370,125 Electrical Transmission of Power . . . June 1, 1883 370,126 Electrical Transmission of Power . . . June 1, 1883 370,127 Electrical Transmission of Power . . . June 1, 1883 370,128 Electrical Transmission of Power . . . June 1, 1883 370,129 Electrical Transmission of Power . . . June 1, 1883 370,130 Electrical Transmission of Power . . . June 1, 1883 370,131 Electrical Transmission of Power . . . June 1, 1883 438,300 Gauge for Testing Fibres for Incandescent Lamp Carbons. . . . . . . June 1, 1883 287,511 Electric Regulator . . . . . . . . . .June 25, 1883 287,512 Dynamo Electric Machine. . . . . . . .June 25, 1883 287,513 Dynamo Electric Machine. . . . . . . .June 25, 1883 287,514 Dynamo Electric Machine. . . . . . . .June 25, 1883 287,515 System of Electrical Distribution. . .June 25, 1883 297,582 Dynamo Electric Machine. . . . . . . .June 25, 1883 328,572 Commutator for Dynamo Electric Machines June 25, 1883 430,934 Electric Lighting System . . . . . . .June 25, 1883 438,301 System of Electric Lighting. . . . . .June 25, 1883 297,583 Dynamo Electric Machines . . . . . . .July 27, 1883 304,083 Dynamo Electric Machines . . . . . . .July 27; 1883 304,084 Device for Protecting Electric Light Systems from Lightning . . . . . . . .July 27, 1883 438,302 Commutator for Dynamo Electric Machine. . . . . . . . . . . . . . . .July 27, 1883 476,529 System of Electrical Distribution. . .July 27, 1883 297,584 Dynamo Electric Machine. . . . . . . . Aug. 8, 1883 307,030 Electrical Meter . . . . . . . . . . . Aug. 8, 1883 297,585 Incandescing Conductor for Electric Lamps. . . . . . . . . . . . . . . . Sept. 14, 1883 297,586 Electrical Conductor . . . . . . . . Sept. 14, 1883 435,688 Process and Apparatus for Generating Electricity. . . . . . . . . . . . . Sept. 14, 1883 470,922 Manufacture of Filaments for Incandescent Lamps . . . . . . . . . Sept. 14, 1883 490,953 Generating Electricity . . . . . . . . Oct. 9, 1883 293,432 Electrical Generator or Motor. . . . .Oct. 17, 1883 307,031 Electrical Indicator . . . . . . . . . Nov. 2, 1883 337,254 Telephone--Edison and Bergmann . . . .Nov. 10, 1883 297,587 Dynamo Electric Machine. . . . . . . .Nov. 16, 1883 298,954 Dynamo Electric Machine. . . . . . . .Nov. 15, 1883 298,955 Dynamo Electric Machine. . . . . . . .Nov. 15, 1883 304,085 System of Electrical Distribution. . .Nov. 15, 1883 509,517 System of Electrical Distribution. . .Nov. 15, 1883 425,761 Incandescent Lamp. . . . . . . . . . .Nov. 20, 1883 304,086 Incandescent Electric Lamp . . . . . .Dec. 15, 1883 1884 298,956 Operating Dynamo Electric Machine. . . Jan. 5, 1884 304,087 Electrical Conductor . . . . . . . . .Jan. 12, 1884 395,963 Incandescent Lamp Filament . . . . . .Jan. 22, 1884 526,147 Plating One Material with Another. . .Jan. 22, 1884 339,279 System of Electrical Distribution. . . Feb. 8, 1884 314,115 Chemical Stock