Telegraphy and how to learn it; with brief chapters on elementary science, embracing various kinds of electricity, electrical measurements, thermo-frictional electricty, batteries, magnets and magnetism (1901)
Frederic, Wilson. [from old catalog] · Chicago, The Henneberry co · leaf 24
eof the former class. A silver plate, or some-times a lead plate, is coatedwith a fine, powdery depositof platinum, which gives thesurface a rough character, sothat the hydrogen will notreadily adhere to it. Dilutesulphuric acid is used in thisbattery. This plate is sus- FIG. 3 pended between two… … TELEGRAPHY. tween the plate and liquid, but this necessi-tates a constant force to keep the plate inmotion. No mechanical method can whollyprevent the collection of hydrogen on theelectro-negative plate. This can only becompletely accomplished by furnishingsome chemical with which the hydrogen,…
Telegraph
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