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. 1889 Excerpt: ...movement. ANNUNCIATORS. Chapter XLII. Annunciators. The general directions given for the connecting electric bells apply equally to annunciators. These instruments are made for a variety of different places. Fig. 56 illustrates an office call annunciator; Fig. 57 an elevator annunciator; Fig 58 a hotel annunciator Fig. ...
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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. 1889 Excerpt: ...movement. ANNUNCIATORS. Chapter XLII. Annunciators. The general directions given for the connecting electric bells apply equally to annunciators. These instruments are made for a variety of different places. Fig. 56 illustrates an office call annunciator; Fig. 57 an elevator annunciator; Fig 58 a hotel annunciator Fig. 59 is a simple diagram showing how the circuits between push buttons, battery and the annunciator are run. The position of the annunciator is indicated: B indicates the battery; 1, 2, 3 and 4 are push buttons; 5 is a floor key and 6 is a separate electric bell in circuit with the same battery that actuates the system within the house. FIG. 58.--HOTEL ANNUNCIATOR. The indications on the face of the annunciator of calls sent from various points are made in different ways; frequently by needles which change from their normal position when they are actuated by the closing of a circuit, as indicated in Fig. 56, where it is plain the attendant is desired in the auditor's office, and Fig. 58 where calls are recorded from rooms 9, 29 and 50; frequently the call is recorded by a drop or shutter which normally is in a nearly vertical position but when the circuit is closed by pressure on a push button the drop falls and discloses a number or name. In the illustrations shown, each individual annunciator, as distinguished from the whole instrument which is also called an annunciator, consists of a little electro-magnet, FIG. 59.--ANNUNCIATOR CIRCUITS. and an armature which is attracted when circuit is made by pressing the corresponding push button; as soon as the armature moves, a little lever is released which turns over by ns own weight and moves the pointer on the face of the annunciator. A vibrating bell connected in the return wire, leading to the b...
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Add this copy of Bell Hangers Hand-Book to cart. $41.33, new condition, Sold by Media Smart rated 4.0 out of 5 stars, ships from Hawthorne, CA, UNITED STATES, published 2019 by Wentworth Press.
Add this copy of Bell Hangers Hand-Book to cart. $61.95, good condition, Sold by Bonita rated 4.0 out of 5 stars, ships from Newport Coast, CA, UNITED STATES, published 2019 by Wentworth Press.
Add this copy of Bell Hangers' Hand-Book to cart. $61.95, good condition, Sold by Bonita rated 4.0 out of 5 stars, ships from Newport Coast, CA, UNITED STATES, published 2016 by Palala Press.
