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. 1908 Excerpt: ...much greater when the coil is intended for continuous service, because it should not be forgotten that condensers become perceptibly heated in operation, and that the dielectric strength diminishes rapidly when the temperature increases. The common method of constructing condensers is as follows: Sheets of paper are ...
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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. 1908 Excerpt: ...much greater when the coil is intended for continuous service, because it should not be forgotten that condensers become perceptibly heated in operation, and that the dielectric strength diminishes rapidly when the temperature increases. The common method of constructing condensers is as follows: Sheets of paper are cut to the required dimensions, as are also sheets of tin-foil; the sheets of tin-foil are made from 1 to 2 centimeters narrower than the sheets of paper, but very much longer. The number of sheets of paper to be inserted between the tin-foil varies with the power of the coil and the thickness of the sheets themselves, but there should always be, at least, two thicknesses, so as to avoid the breaking down of the condenser due to an unseen fault in the paper. The sheets of paper are varnished or paraffined in advance or are used dry. Place on the table the sheets of paper which are to form the dielectric, then, on top, a sheet of tin-foil. Fig. 63. being careful to leave an equal border of paper on three sides, the tin-foil projecting from the foreside. On this sheet place another layer of papers, lining them up with the first, then another layer of tin-foil with its end projecting from the opposite side, etc., until the condenser is completed. Then the whole mass is placed in an oven, where, it is boiled in rosin or paraffin; finally, while still hot, it is pressed into a firm mass. The extremities of the sheets of tinfoil which extend beyond the two ends, are bent back upon the ones above (Fig. 63), and contact is established by aid of springs which press against these parts; or, better yet, the extremities are bent back upon themselves and soldered to wires, so as to establish a better contact. Nowadays, condensers are often subdivided and pro...
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