Theory and practice of the electric telegraph; a manual for operators and students (1875)
Churchill, Charles Henry, d. 1904. [from old catalog] · Oberlin, Ohio, Sherman & bros. · leaf 52
s equally intense with this, and will-sup-ply several wires as readily as Daniells will one. 7. Describe Groves battery?Groves battery has the usual glass jar containing a mixture of eight parts of wa-ter and one of sulphuric acid. In this is azinc cylinder open at the side and ends toadmit freely… … MANUAL OF TELEGRAPHY.
Telegraph
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![An illustration from Essai de physique, par Mr. Pierre van Musschenbroek ... avec une description de nouvelles sortes de machines pneumatiques, et un recueil d'expériences par Mr. J. v[an] M[usschenbroek] Traduit du hollandois par Mr. Pierre Massuet .. (1751)](https://img.insideoutlibrary.com/img/200/ia-essaidephysiquep01muss-431-74.webp)
