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 189
tional view of one of them isgiven separately at A. It con-tains a cavity in the form of ahollow cylinder, adapted to re-ceive one half of the coil seenat C, the remaining half pass-ing into the other cylinderwhen they are fitted together.A longitudinal opening on oneside of the cylinders allowsthe… … 172 DAVISS MANUAL. appears, and the adhesion does not continue as withthe semicircles. When one of the cylinders is passedover the coil, the part exterior to the coil exhibits nosensible polarity. 275. Ribbon Spiral. — Fig. 112 represents astrip of sheet copper, coiled into a spiral. This c…
