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: ...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 ...
Read More
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: ...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. 127. T, .. 'tig. 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, microphone, and switch-board, is fixed in each office, each instrument being numbered. A wire from every one station to every other one is run through and attached to the terminal at the top of the instrument corresponding to its number. If ten offices are to be connected, te...
Read Less
Add this copy of The Practical Telephone Handbook: and Guide to the to cart. $22.29, new condition, Sold by Ingram Customer Returns Center rated 5.0 out of 5 stars, ships from NV, USA, published 2021 by Legare Street Press.
Add this copy of The Practical Telephone Handbook: and Guide to the to cart. $23.83, like new condition, Sold by GreatBookPrices rated 4.0 out of 5 stars, ships from Columbia, MD, UNITED STATES, published 2021 by Legare Street Press.
Choose your shipping method in Checkout. Costs may vary based on destination.
Seller's Description:
Fine. Trade paperback (US). Glued binding. 436 p. In Stock. 100% Money Back Guarantee. Brand New, Perfect Condition, allow 4-14 business days for standard shipping. To Alaska, Hawaii, U.S. protectorate, P.O. box, and APO/FPO addresses allow 4-28 business days for Standard shipping. No expedited shipping. All orders placed with expedited shipping will be cancelled. Over 3, 000, 000 happy customers.
Add this copy of The Practical Telephone Handbook: and Guide to the to cart. $24.08, new condition, Sold by GreatBookPrices rated 4.0 out of 5 stars, ships from Columbia, MD, UNITED STATES, published 2021 by Legare Street Press.
Choose your shipping method in Checkout. Costs may vary based on destination.
Seller's Description:
New. Trade paperback (US). Glued binding. 436 p. In Stock. 100% Money Back Guarantee. Brand New, Perfect Condition, allow 4-14 business days for standard shipping. To Alaska, Hawaii, U.S. protectorate, P.O. box, and APO/FPO addresses allow 4-28 business days for Standard shipping. No expedited shipping. All orders placed with expedited shipping will be cancelled. Over 3, 000, 000 happy customers.
