The Boston school compendium of natural and experimental philosophy .. (1837)
Parker, Richard Green, 1798-1869 · Boston : Marsh, Capen & Lyon · leaf 171
*In the electrical department of the Boston School Set, there is a brasswire in the form of an S, as above described, together with brass balls, mountedon wires, to represent the sun, earth, and moon, revolving around their commoncentre of gravity. 6. What is the sixth >. How may the jar be… … ELECTRICITY. 161 i having a fork, to which any small substance may be attached. Thewhole is insulated by glass legs or pillars. The rods slide throughcollars, by which means their distance from one another may be ad-justed. In using the universal discharger, one of the rods or slides mustbe…
Physics
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