Modern electricity and magnetism, theoretically and practically considered (1885)
Avery, Elroy M[cKendree], 1844- [from old catalog] · New York and Chicago, Sheldon and company · leaf 40
ogetherequal quantities of resin and Venice turpentine and then adding alike quantity of shellac. The substances should be heated graduallyand stirred together so as to prevent the forming of bubbles. Becareful that the mixture does not take fire in course of preparation.The Venice turpentine is… … may be fastened to the disc for the purpose. A still better plan isto make the cover of wood, a little less in diameter than the resinousplate. Its edges should be carefully rounded off. For a handle, aglass rod or tube may be tightlythrust or cemented into a hole inthe middle of the cover. Place…
Electricity · Magnetism
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