History, theory, and practice of the electric telegraph (1866)
Prescott, George B.(George Bartlett),1830-1894 · Boston, Ticknor and Fields · leaf 47
huric acid diluted with tenor twenty times its volume of water. The other metal is plati-num, and not copper, and is plunged into nitric acid, either pureof 40°, or diluted with half its volume of water, or mixed with 28 PRELIMINARY NOTIONS. one fourth concentrated sulphuric acid. The diaphragm by… … Fig. 6. in this state these substances have the advantage of being suffi-ciently porous to permit communication between the liquids, andat the same time of entirely preventing their mixture.
Telegraph
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