ix, and the two carbons, longer, and the resistance tu the passing current becomes through the medium of levers, are drawn apart until the | iis magnetism and tension of the spring balance each other, ity “im Fig 2 and asthe carbon is burned away the arc is lengthened, the magnetism reduced, when… … ranged with their flat side to the light, and the other half greater, its power to excite the electro-magnet corresponding- lave their angular side toward the light. Below the focus is a bowl shaped glass, having a zone ground just wide ly decreasing. The armature, E, is drawn away from the magnet…
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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-essaidephysiquep02muss-480-77.webp)
