book: Electric light cables and the distribution of electricity

book: Electric light cables and the distribution of electricity | Stuart Arthur Russell ...

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	• Electric light cables and the distribution of electricity Stuart Arthur Russell RareBooksClub.com, 2012 - 78 pages view larger image
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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. 1892 Excerpt: ...one below it, between a pair of rollers, which fold each strip half round the core, and firmly press together the edges of the upper and lower strips in such a manner as to make a good longitudinal joint along each side. When a sufficient number of layers of compound rubber has been put on to give the requisite thickness, the core is tightly bound with a spiral wrapping of prepared rubber tape, and is then ready for vulcanizing. The object of putting the compound rubber on in several separate layers is, to render it practically impossible for any weak place in the rubber to extend right through the covering; as, if we suppose that in any given length there is one faulty place in each coating, it is extremely improbable that they should all occur at the same point. Another reason is, that the longitudinal joints-are better made with a number of comparatively thin layers, and the soundness of these joints is, as will be readily understood, most important. In order that the several layers, as many as eight or ten being put on some heavily insulated cables, should adhere together, and that the longitudinal seams should be well made, it is necessary that the surfaces of the rubber should be absolutely clean and free from grease of any kind; and the successful manufacture of these cables depends, to a very VULCANIZED EUBBEIi CABLES. 149 great extent, therefore, on the careful handling of the rubber. The pure rubber may be replaced by a layer of prepared tape, which very effectively keeps the copper clean, although it does not add to the resistance like the pure rubber; and, of the coatings of compound rubber, some may be of a separator, and some of a sulphurized rubber, or all may be of one quality. When ready for vulcanizing, the core is coiled on drums which ar...

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