Gage, Alfred P. (Alfred Payson), 1836-1903, Fessenden, C · Toronto : W.J. Gage · leaf 230
lecture-room experiments; but they require frequent attention, andare expensi\e, so that they are little used for work of longduration. … 212 ELECTPvICITY AND MAGNETISM. Fig. 130. § 166. Gravity battery. — The battery principally- used inthis country for telegraphing is called the gravity battery. Acopper plate C, Figure 130, isplaced on the bottom of a vesseland covered with crystals of cop-per sulphate (blue vitriol), andthe whole…
Physics
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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-480-79.webp)
