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 118
he ends, C and D, of the wires being connected with the screw cups, A and B. i^>. 55. 1^1- Upright Galvanometer.— In this instrument, represented inFig. 55, both the coil of wire andthe needle are placed in a verticalposition, the north pole being madea little heavier, in order to keepthe magnet… … 102 r-AVIss MANUAL. 162. Galvanometer with Astatic Needle. —This instrument is represented in Fig. 39, in connec-tion with a thermo-electric pair. It is constructed ona small scale, in order to be delicate j and the needleis nearly astatic. The slight degree of directivetendency which the needle is…
