A manual of electricity, magnetism and meteorology (1844)
Lardner, Dionysius, 1793-1859, Walker, Charles Vincent, 1812-1882 · London Longman, Brown, Green & Longmans · leaf 541
is specially applied to very delicate observations. Thecoated wire is coiled round a frame beneath the needle;the needle is suspended by a single fibre of silk. Thesupports are three adjusting screws for levelling theinstrument. The screw at the right is for turning thestage on which the system…
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.
