Johnson's natural philosophy and key to philosophical charts : illustrated with 500 cuts; being reduced photographic copies of all the diagrams contained in the author's philosophical series of indestructible school charts ; for the use of schools and families (1878)
through an almost inappreciable space. 774 Bodies suspended -without contact.—If one end ofa bar of iron be brought near to one extremity of a longitudinal helix,vertically placed, and connected with the battery, it will be attracted byand drawn into the helix, where it will remain suspended… … 775. Utilization of electro-magnetic force.—Many at-tempts have been made to utilize this very controllable force, by apply-ing it as a motive-power ; but the force (diminishing even more rapidlythan the square of the distance from the magnet increases) acts throughsuch a limited distance, that no…
Physics · Astronomy
Internet Archive · University of Connecticut Library · Public Domain Mark 1.0. Free to use for anything.
