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. 1904 edition. Excerpt: ... the coil of R, energizing the magnet and holding the shutter armature fast, as already described. The coil of R, being of low ...Read MoreThis 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. 1904 edition. Excerpt: ... the coil of R, energizing the magnet and holding the shutter armature fast, as already described. The coil of R, being of low resistance, would greatly injure the battery, if connected direct to the wire coming from D, and to ohviate this difficulty the needed resistance is introduced into the circuit by connecting the wire at the hinge of the drop shutter, F, and allowing the current to flow through the shutter, the armature, Aa, and thence through the hinge into the coil of the magnet. The circuit is completed through the earth and back to the restoring battery. Combined Drops and Jacks.--Another piece of improved switchboard apparatus, having the same object--saving the operator's time and simplifying her movements--is the combined drop and jack; which is to say, the two instruments made so as to occupy the same space on the switchboard panel. The Fig. 138.--Combined Drop and Jack of the Western Telephone Construction Co. arrangement has the added advantage of saving room, and enabling a larger number of subscribers' drops to be mounted in a given space. Several types of combined drop and jack have been placed on the market, each having its particular points of excellence and advantage. Western Drop-Jack.--Fig. 138 represents the combined drop and jack manufactured by the Western Telephone Construction Co., of Chicago. Here the magnet, E, and the jack-piece, J, the latter a solid brass casting, are secured to the base piece, A, of hard rubber. The armature of the magnet h attached to the bar, F, pivoted at P to the head piece, H, being, however, normally held away from the pole of the magnet by a small leaf spring, S, bearing against its length, which effectually prevents "freezing" or "sticking" to the pole. When the...Read Less
New. 393 pages. Reprinted from 1904 edition. NO changes have been made to the original text. Each page is checked manually before printing. Illustrations, Index, if any, are included in b/w. Fold-outs, if any, are not part of the book. If the original book was printed in multiple volumes than this reprint is of only a single volume. This paperback book is SEWN perfect bound, where the book block is actually sewn (smythe sewn/section sewn) with thread before binding which results in a more durable type of paperback binding. It can also be open wide. The pages will not fall out and will be around for a lot longer than normal paperbacks. This book is printed on demand on acid-free paper. (Original publisher, Audel)
New. pp. 393. Pages 393 It is the reproduction of the original edition published long back (1904 ). Hardcover with sewing binding with glossy laminated multi-Colour Dust Cover, Printed on high quality Paper, professionally processed without changing its contents. We found this book important for the readers who want to know about our old treasure so we brought it back to the shelves. Print on Demand.
New. 383 pages. Reprinted from 1904 edition. New 2013 edition in PAPERBACK is SEWN PERFECT BOUND, much more durable than a standard paperback. This is a quality reprint of an old book of historical value. If the original book was printed in multiple volumes than this reprint is of only a single volume. This is an exact/strict reproduction of text, no changes has been made in respect to the original text. A lot of effort has been made to check and improve each page/scan manually for its quality of text and illustrations (if any, are in b/w). Folded illustrations, if any, are not included in the book. This is not a retyped or an ocr'd book. Index, contents, etc, if any in the original book, are included. This item is printed on demand using good quality natural shade paper. The title of the book, on the cover, is in gold lettering.
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