Elementary lessons in electricity and magnetism (1906)
Thompson, Silvanus P. (Silvanus Phillips), 1851-1916, Schwetzky, Otto H. L. [from old catalog] · Chicago, Thompson & Thomas · leaf 367
ct a piece of softiron alternately up and down, with a motion like thepiston of a steam-engine, which is converted by a crankinto a rotatory motion. In these cases the difficultyoccurs that, as the attraction of an electromagnet falls offnearly in inverse proportion to the square of the… … 342 ELEMENTARY LESSONS ON [chap. vii. as electromotors, and, Indeed, are the most efficient ofelectromagnetic engines. In 1839 Jacobi propelled a boat along the river Nevaat the rate of 2^ miles per hour with an electromagneticengine of about one horse-power, worked by a battery of64 large Groves…
Electricity · Magnetism
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
