Canadian foundryman (1921) . but which was after-wards correctly attrib-uted by Hawkesbee toelectricity. Wall, in1708, observed thesparks produced fromamber, and Hawkes-bee noticed the sparksand snapping undervarious modifications. Dufay and the AbbeNollet were the first todraw sparks from thehuman body, an exper-iment which attractedgreat attention and be-came a species of fash-ionable diversion atthe The discovery of the 34 38 18 CANADIAN FOUNDRYMAN Volume XII Leyden jar is attributedto Cunaeus of Ley-den, in 1746, who, while handling a vesselcontaining water in communication with ane
Canadian foundryman (1921) . but which was after-wards correctly attrib-uted by Hawkesbee toelectricity. Wall, in1708, observed thesparks produced fromamber, and Hawkes-bee noticed the sparksand snapping undervarious modifications. Dufay and the AbbeNollet were the first todraw sparks from thehuman body, an exper-iment which attractedgreat attention and be-came a species of fash-ionable diversion atthe The discovery of the 34 38 18 CANADIAN FOUNDRYMAN Volume XII Leyden jar is attributedto Cunaeus of Ley-den, in 1746, who, while handling a vesselcontaining water in communication with anelectrical machine, was surprised at receivinga severe shock; a similar event had happenedthe year previous to Von Kleinst, a Germanprelate. round the frictional machine and the voltaicbattery. The first-named is now only ofexperimental interest, and the second, if weexcept its use on signalling (telegraphy andtelephony) has been practically supplantedby the more economical and vastly morepowerful dynamo-machine. To this con-. FIG. 1—A TYPICAL ELECTRIC GENERATOR. Guericke was the great electrician of theseventeenth century; in the eighteenth cen-tury the names of the principal contributorsto the advancement of electrical sciencewere Newton, Hawkesbee, Dufay; Cunaeusof Leyden to whom we owe the Leyden jar,and Franklin, who, in 1747, pointed out thecircumstances, on which the action of theLeyden jar depends. Monnier the youngerdiscovered that the electricity which bodiescan receive depends on their surface ratherthan their mass, and Franklin soon foundthat the whole force of the bottle and thepower of giving a shock is in the glass itself;he further in 1750, suggested that electricityand lightning were identical in their nature,and in 1752 demonstrated this fact by meansof his kite and key. About the same timeDAlibard and others in France erected apointed rod forty feet high at Marli, for thepurpose of verifying Franklins theory,which was found to give sparks on the pass-age of
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectfoundri, bookyear1921
