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. 1893 edition. Excerpt: ...of that section with any wire whatsoever, without the cooperation of a second operator. Thus, if subscriber No. 200 wishes to speak to i I No. 401, the operator at board C, which contains No. 401, need not be informed; but, by placing a peg in the switch-springs so numbered, the operater at A can at once ...
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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. 1893 edition. Excerpt: ...of that section with any wire whatsoever, without the cooperation of a second operator. Thus, if subscriber No. 200 wishes to speak to i I No. 401, the operator at board C, which contains No. 401, need not be informed; but, by placing a peg in the switch-springs so numbered, the operater at A can at once effect the required connection between 200 and 401. In the same way the operator of switchboard C could make the same connection at that board, if required to do so by subscriber No. 401. The difference between this system and that hitherto in general use will be easily understood by comparing fig. 188 with fig. 189, which latter represents ordinary switches, with through-connection wires between the boards. To make connection between Nos. 100 and 201, No. Iod switch-hole must be joined by a flexible cord to a special wire c, which leads to board c, and connection there made by another cord between a and 201. The Teverse operation also must be performed for disconnecting the two subscribers at the termination of their conversation. Fig. 190 represents a section and fig. 191 a half-elevation, of a Western Electric multiple switchboard, from which the general disposition of the apparatus may be understood. The wires of the subscribers to whom the operators at each section have to attend pass through the indicators at A and the switch-springs at B. These latter are called the "local" Fig. 190. About real size. or "individual" switch-springs. All the wires of the entire exchange, including the "local" wires, are brought to the switch-springs at C. Thus the "local" ARRANGEMENT OF APPARA TUS. asi springs are duplicated in each section of the switch. The springs at c are arranged in hundreds in such order that the...
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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.
Choose your shipping method in Checkout. Costs may vary based on destination.
Seller's Description:
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.
