This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1890 Excerpt: ...repelled to the upper side. By touching the upper side of the cover while it is still in contact with the vulcanite disk, the negative electricity will pass from the cover through the body of the operator to the ground, and only positive electricity will be retained by the cover. If now the cover be raised from the ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1890 Excerpt: ...repelled to the upper side. By touching the upper side of the cover while it is still in contact with the vulcanite disk, the negative electricity will pass from the cover through the body of the operator to the ground, and only positive electricity will be retained by the cover. If now the cover be raised from the vulcanite disk by means of the insulating handle, a spark may be drawn from it. This is due to the combination of the positive charge on the cover with the negative induced in the hand by this charge. The cover may be replaced upon the vulcanite disk, and the operation may be repeated indefinitely, when the conditions are favorable, without further excitation. Instead of a vulcanite disk, a cake formed of resin, shellac, and a small Fig. 356. Winter's Electrical Machine. proportion of Venice turpentine may be used. The materials are melted, thoroughly mixed, and poured into a circular tin pan. The cake thus formed is allowed to remain in the' pan, and is used in the same manner as the vulcanite disk. Winter of Vienna devised a simple frictional electrical machine, an inexpensive form of which is shown in Fig. 356. In the top of the cast iron standard is journaled a shaft having at one end a crank by which it may be turned, and furnished at the opposite end with a pair of collars between which is clamped a vulcanite disk. In a socket at the base of the standard is inserted a forked bar of wood which extends upwardly and embraces the vulcanite disk, each arm of the fork being provided on its inner face with a silk or woolen cushion charged with bisulphide of tin and arranged to press on the disk. Upon a vulcanite column rising from the base board near the edge of the disk is supported a metallic ball. to which are attached metallic rings arranged o...
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PLEASE NOTE, WE DO NOT SHIP TO DENMARK. New Book. Shipped from UK in 4 to 14 days. Established seller since 2000. Please note we cannot offer an expedited shipping service from the UK.