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. 1914 Excerpt: ...operator's talking set will be connected to the order wire at the same time, and without waiting a response from the "B " operator she will immediately order up the connection desired, whereupon the "B" operator will assign an idle trunk in the usual manner. When the "A" operator removes her finger from the order wire ...
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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. 1914 Excerpt: ...operator's talking set will be connected to the order wire at the same time, and without waiting a response from the "B " operator she will immediately order up the connection desired, whereupon the "B" operator will assign an idle trunk in the usual manner. When the "A" operator removes her finger from the order wire key, the line switch restores to normal position. A "B" operator's position may be made busy to all incoming calls when desired by throwing the order wire busy key shown in the diagram, thereby operating the 1300-ohm relay bridged across the circuit. The effect is to connect to earth the master switch bank contact corresponding to the trunk. At any time when the "B" operators of a certain group are all busy, all the chain relays of that group will be energized, the circuit of the stop relay will be closed and the busy circuit will be closed through the primary of the busy induction coil. Since the negative battery connection to all line switch pull-down coils is cut off when the stop relay is energized, no line switch can be operated under these conditions, and the busy signal is transmitted through the back contacts of the line-switch relay to any "A " operator depressing an order wire key. The instant any chain relay is released, however, the line switch of the operator who has depressed her order wire key seeking a connection will seize the idle order wire trunk. The busy signal is closed during the operation of the master switch mechanism also. The apparatus may be used either with, or without, what is called the position blocking feature, as desired. That is, it may be arranged to distribute the load evenly among the "B" operators, regardless of the relative efficiencie...
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Add this copy of Automatic Telephony: A Comprehensive Treatise On to cart. $22.29, 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 Automatic Telephony: A Comprehensive Treatise On to cart. $33.45, 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 Automatic Telephony: A Comprehensive Treatise On to cart. $34.95, new condition, Sold by Ria Christie Books rated 4.0 out of 5 stars, ships from Uxbridge, MIDDLESEX, UNITED KINGDOM, published 2022 by Legare Street Press.
Add this copy of Automatic Telephony: A Comprehensive Treatise On to cart. $45.67, new condition, Sold by Ria Christie Books rated 4.0 out of 5 stars, ships from Uxbridge, MIDDLESEX, UNITED KINGDOM, published 2022 by Legare Street Press.
Add this copy of Automatic Telephony: a Comprehensive Treatise on to cart. $47.77, good condition, Sold by Mullen Books, Inc. ABAA / ILAB rated 4.0 out of 5 stars, ships from Marietta, PA, UNITED STATES, published 1914 by McGraw-Hill Book Company.
Edition:
first edition, second printing--corrected
Publisher:
McGraw-Hill Book Company
Published:
1914
Alibris ID:
17967442146
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Seller's Description:
Good (ex-library with expected marks. small tear to the bottom of pg 1. wear and soiling from use. wear to cloth, especially at corners, but library binding holding well. end papers used in rebinding are slightly acidic) Green library buckram. xii + 407 pp. 271 bw figures, 3 foldout diagrams.
Add this copy of Automatic Telephony. a Comprehensive Treatise on 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 1921 by McGraw-Hill.
