Spon, Ernest, Haldane, Robert, Lock, Charles G. Warnford (Charles George Warnford), 1853-1909 · London ; New York : E. & F.N. Spon · leaf 201
ordinary tele- with even numbers are connected to the phonic circuit, and the sounds made in lower bolt and insulated from the the transmitting instrument are repro- upper, and all the uneven-numbered duced in the telephone. discs are in contact with the upper bolt, Fig. 102 shows the cylindrical… … portions recrystallize, and the selenium undulatory light being thrown xipon its is thereby rendered both sensitive to cylindrical face by a paraboloid re- light and a conductor of electricity. flector, in whose focus it is placed. Prof. Bell states that the whole process This beautiful little…
Workshop recipes · Technology · Industrial arts
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
