Davis's manual of magnetism : including galvanism, magnetism, electro-magnetism, electro-dynamics, magneto-electricity, and thermo-electricity (1854)
Davis, Daniel · Boston : Palmer and Hall · leaf 86
r greatly in their power to excitea current, when associated together in thermo-electricpairs. Some of the peculiarities in the combina-tions of the more useful metals will be stated. It isnecessary, however, to say a few words with regardto the galvanometer, an instrument to indicate ormeasure… … arrangement such as Fig. 39, where G is the gal-vanometer, consisting of a magnetic needle in close 70 DAVISS MANUAL. proximity to a coil of wire, above which is fixed agraduated circle, the direction of an electrical currentmade to pass through the wire is indicated by thedeflection of the needle…
