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 182
e ofthe current. The iron filings fall off when the cur-rent ceases to flow; but if steel filings be employed,part of them remain attached, in consequence of theadhesion of the magnetized particles among them-selves. A short wire is better for this experimentthan one of considerable length ; and a… … the manner of a corkscrew, so as to form a hollowcylinder, into which the body to be magnetized canbe inserted. Such a coil is denominated a helia:) 166 DAVISS MANUAL. and is represented in Fig. 107, mounted upon astand. A single circular turn is more efficient thanthe straight wire, and each turn…
