Electrical installations of electric light, power, traction and industrial electrical machinery (1902)
Kennedy, Rankin, d. 1917 · Edinburgh T.C. & E.C. Jack · leaf 73
d instruments we have permanent steelmagnets producing a pull or directive force on a needle, or opposingthe motion of a coil, and in delicate instruments we use the earthsmagnetic field to oppose the forces to be measured ; and for themost refined measurements we employ astatic needles, so that… … known current; while a movable coil between them carries thecurrent to be measured, entering by mercury cups, the upper fixedcoil repels and the lower coil attracts the movable coil, so that weightsmust be added to the scale pan until balance is obtained, when the weights will be propor-tional to…
Electrical engineering · Electric power
Internet Archive · Gerstein Library, University of Toronto · Public Domain Mark 1.0. Free to use for anything.
