Spon, Ernest, Haldane, Robert, Lock, Charles G. Warnford (Charles George Warnford), 1853-1909 · London ; New York : E. & F.N. Spon · leaf 197
ed phonic circuit, and the sounds made in with even numbers are connected to the the transmitting instrument are repro- lower bolt and insulated from the duced in the telephone. upper, and all the uneven-numbered Fig. 102 shows the cvlindrical form discs are in contact with the up])er bolt, of… … portions recrystallize, and the selenium undulatory light being thrown upon 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
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