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. 1891 Excerpt: ... it is laid on prong B, carried in an ebonite bush, A, let into Fig. 125.--Scale J. the switch-table. Its weight presses down the spring c from a platinum contact on the brass plate D; c and D form part of the primary circuit of the transmitter. An ingenious plan for the same purpose, called Gray's Contact Breaker, is ...
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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. 1891 Excerpt: ... it is laid on prong B, carried in an ebonite bush, A, let into Fig. 125.--Scale J. the switch-table. Its weight presses down the spring c from a platinum contact on the brass plate D; c and D form part of the primary circuit of the transmitter. An ingenious plan for the same purpose, called Gray's Contact Breaker, is shown in Fig. 126. The receiver is Fig. 126.--Scale J. furnished with three terminals, ABC. Under A is fastened the flat spring D. From B a wire extends to a contact plate, F. The connections to the transmitter are shown in the figures, and it will be seen that the connection to B is common to both the secondary and primary circuits. The operator, in taking up the instrument, closes the primary circuit by pressing D against F. An objection to this form is that the flexible tinsel telephone cord is introduced into the primary circuit, the resistance of which is rather high, and gets higher with use. The operator has always to grasp the instrument in the same manner, and she is always in circuit with the secondary circuit, which is objectionable during lightning storms. In addition to the above arrangements, it is desirable to provide a two-way switch in the primary circuit, joined up to two cells, so that the operator may, by movingover the switch now and then during the day, change the working cell. The connections for this are shown in Fig. 126. Domestic Switch-boards.--Fig. 127 shows an instrument made by the Western Electric Company, designed for the joining up by telephones of a number of rooms in the same or adjoining buildings, so that a person at any one station may ring and speak to any other one without the aid of an ordinary switch-board and operator. To accomplish this an instrument like Fig. 127, which comprises switch-bell, microp...
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Add this copy of Practical Telephone Handbook and Guide to the Telephone to cart. $20.57, new condition, Sold by Ingram Customer Returns Center rated 5.0 out of 5 stars, ships from NV, USA, published 2022 by Legare Street Press.
Add this copy of Practical Telephone Handbook and Guide to the Telephone to cart. $30.01, new condition, Sold by Ingram Customer Returns Center rated 5.0 out of 5 stars, ships from NV, USA, published 2022 by Legare Street Press.
Add this copy of Practical Telephone Handbook and Guide to the Telephone to cart. $34.66, like new condition, Sold by Phatpocket Limited rated 4.0 out of 5 stars, ships from Waltham Abbey, ESSEX, UNITED KINGDOM, published 2010 by Nabu Press.
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Seller's Description:
Like New. Used-Like New. Book is new and unread but may have minor shelf wear. Ships from UK in 48 hours or less (usually same day). Your purchase helps support Sri Lankan Children's Charity 'The Rainbow Centre'. 100% money back guarantee. We are a world class secondhand bookstore based in Hertfordshire, United Kingdom and specialize in high quality textbooks across an enormous variety of subjects. We aim to provide a vast range of textbooks, rare and collectible books at a great price. Our donations to The Rainbow Centre have helped provide an education and a safe haven to hundreds of children who live in appalling conditions. We provide a 100% money back guarantee and are dedicated to providing our customers with the highest standards of service in the bookselling industry.
Add this copy of Practical Telephone Handbook and Guide to the Telephone to cart. $45.62, good condition, Sold by Bonita rated 4.0 out of 5 stars, ships from Newport Coast, CA, UNITED STATES, published 2022 by Legare Street Press.
Add this copy of The Practical Telephone Handbook, and Guide to the to cart. $50.00, very good condition, Sold by Argosy Book Store rated 5.0 out of 5 stars, ships from New York, NY, UNITED STATES, published 1927 by Pitman.
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Seller's Description:
Very good. 687 illustrations. xxv + 870 pages, thick 8vo, blue cloth with gilt lettering; bookplate inside front cover, ownership signature front free endpaper, covers lightly rubbed. London: Sir Isaac Pitman & Sons, 1927. A very good copy.
