Easy electrical experiments and how to make them; (1918)
Dickinson, Leonard Perley, 1874- [from old catalog] · Chicago, F. J. Drake & co · leaf 194
IMENTS. 179 1% inch, and is thick enough to be quite stiff. This stripis pivoted between two small upright supports one of whichis shown at F. When exactly vertical, the strip K shouldleave a clear space of 1-64 inch between it and the ironcores, this space being left so that the ends of the cores… … Fire Alarm Telegraph. Bell First it serves as a support for the spiral spring S, whichdraws the strip K toward the left. Secondly, it serves as astop for strip K, preventing it from going too far toward the left.To the upper end of K is fastened a wire, which carriesat its upper end a rather heavy…
Electric apparatus and appliances · Electricity
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
