Elementary Treatise on Natural Philosophy, Volumen3

action amount apparatus armature arrangement attraction axis ball battery becomes bismuth body called carried cells centre charge circuit coating coil conductor connected consists containing copper cylinder deflection denote described difference diminished direction disc discharge distance earth effect electricity electrified electro-magnet electro-motive force employed energy equal experiment field galvanometer give given glass greater hand heat Hence horizontal increase indicated induced influence insulated intensity iron junction kind latter length light lines lines of force lower machine magnet means measured metal motion move movements nearly needle negative observed obtained opposite parallel passes plane plate poles portion positive potential powerful produced proportional quantity receiving regarded represented repulsion resistance resultant rotation round shown side similar spark suppose surface suspended temperature tends tion tubes turned unit upper usually vertical whole wire zinc