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. . . . . . . . . .