A manual of electricity, magnetism and meteorology (1844)
Lardner, Dionysius, 1793-1859, Walker, Charles Vincent, 1812-1882 · London Longman, Brown, Green & Longmans · leaf 473
191-j so that a small portion at the middleof their length shall be horizontal, while the remainderis vertical. Under the horizontal part of each let anagate cap be fixed, by which the magnet may be sup-ported on a vertical pivot; and on the upper surfaceof the horizontal part let a small cup, to… … the motion of the magnets, Fig. 191. they are provided with wireloops on the lower parts, whichembrace the wire supportingthe pivot, and prevent themagnets swerving from thevertical position. A small cir-cular canal containing mercurysurrounds each magnet a littlebelow the rectangular bend,and is…
Atmospheric electricity · Electricity -- Early works to 1850 · Magnetism
Internet Archive · Gerstein Library, University of Toronto · Public Domain Mark 1.0. Free to use for anything.
