Identifier: dictionaryofarts02smit (find matches)
Title: The dictionary of arts, sciences and manufactures ... embracing in all nearly three thousand articles on arts and sciences
Year: 1859 (1850s)
Authors: Smith, James, author of the Panorama of science and art
Subjects: Technology Industrial arts
Publisher: Boston, Phillips, Sampson, and Co.
Contributing Library: Smithsonian Libraries
Digitizing Sponsor: Smithsonian Libraries

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of the leg. Two black or two whiterepelled each other with considerable force, but a white and ablack one would, if permitted, rush together with surprising-violence ; their inflation subsiding at the same time, and en-tirely ceasing when they were in contact. On separating them,their electricity was renewed. At first Symmer found it re-quired a force of from one to 12 ounces to separate them ; atanother time they required 7 ounces to separate them, whichweight was twenty times that of a single stocking ; and itwas applied in a direction parallel to its surface. When oneof the stockings was turned inside out, and put within theother, it required 20 ounces to separate them; though at thattime ten ounces were sufficient, applied externally. Gettingthe black stockings new dyed, and the white ones washed,and whitened in the fumes of sulphur, and then puttingthem one within the other, with the rough sides together,it required three pounds three ounces to separate them. With ki,k (-nwriT y
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ELECTRICITY. 263 Theory of electricity.—Transparency produced by electricity. stockings of a more substantial make, the cohesion was greater.In like manner, electrical effects will be obtained by rubbingwith the hand or other substances any small pieces of blackand white silk. A number of experiments were made withblack and white ribbons, which with slight difference in themode of rubbing, or of the surfaces of the bodies in contactwith them, acquired negative and positive electricity byturns. Symmer also made some experiments on the electrical cohe-sion of glass, and was followed by others. The ensuing ac-count will give some idea of the process used. A coated plateof glass was charged, and then the coating was taken off thenegative surface, to which another uncoated and unchargedplate of glass was applied. A coating was then put on theuncharged glass, so that the whole resembled one coated plateconsisting of two lamina. On making acommunication be-tween the two coatings, an explos

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