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 29
specific gravity causes itto remain at the bottom,in contact with the copperplate. The zinc plate issuspended in the clearliquid above. To start theaction quickly, a teaspoon-ful of common salt or ofzinc sulphate is dissolvedin the water. As the chem-ical action proceeds, thevitriol is decomposed,… … FIG. 6 CHAPTER IV. ELECTRICAL MEASUREMENTS. The wonderful developments of electricalscience in recent years are almost whollydue to a better understanding of what elec-trical measurements can and ought to bemade, and how to make them. Most of thisincreased knowledge has been gained sincethe first…
Telegraph
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