History, theory, and practice of the electric telegraph (1866)
Prescott, George B.(George Bartlett),1830-1894 · Boston, Ticknor and Fields · leaf 51
thatthe nitric acid cannot ascend as far as the copper rod. It is evi-dent that in this pile the amalgamated zinc is outside the carbon;it is a hollow cylinder plunged into the glass vessel that is filledwith diluted sulphuric acid; the porous tube is placed in the inte-rior of the zinc cylinder,… … Fig. 11. lines in this country during the past five years, having been de-signed, however, more particularly for use in electro-metallurgy. This battery was made upon noticing the property which roughsurfaces possess of evolving the hydrogen, and smooth surfacesof favoring its adhesion. Thus,…
Telegraph
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