Spon, Ernest, Haldane, Robert, Lock, Charles G. Warnford (Charles George Warnford), 1853-1909 · London ; New York : E. & F.N. Spon · leaf 177
h electricity and light well. Several thin sheets of reheated selenium are enclosed between these sides, and it results therefrom that the current traverses the selenium in the direction of the light that strikes it ; and it appears that, owing to this arrangement, the changes in resistance caused… … that they appear, before reheating, of a Selby's battery. blood-red colour when they are looked at against the light. by setting up a " counter " current. Fig. 100 shows the press employed In the " porous pot form " the acid for softening the selenium plates by this seems quite necessary to lower…
Workshop recipes · Technology · Industrial arts
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
