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The Telephone, the Microphone, and the Phonograph. Transl (Paperback) Loot Price: R386 Discovery Miles 3 860
The Telephone, the Microphone, and the Phonograph. Transl (Paperback): Thodore Achille L. Du Moncel, Theodore Achille L. Du...
The Telephone, the Microphone, and the Phonograph. Transl (Paperback): Thodore Achille L. Du Moncel, Theodore Achille L. Du...

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The Telephone, the Microphone, and the Phonograph. Transl (Paperback)

Thodore Achille L. Du Moncel, Theodore Achille L. Du Moncel

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Loot Price R386 Discovery Miles 3 860

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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. 1879 edition. Excerpt: ...or barometric pressure. The other extremity is supported by another socket I, fitted to a screw-nut H, which may be more or less tightened by a regulating screw. If this system is introduced into a galvanometric circuit a, b, c, i, g, provided with all the instruments of the electric scale of measure, the variations in length of the substance inserted are translated by greater or less deviations of the galvanometric needle, which follow from the differences of pressure resulting from the lengthening or shortening of the surface capable of expansion which is inserted in the circuit. The experiments on the microphone made in London at the meeting of the Society of Telegraphic Engineers on May 25, 1878, were wonderfully successful, and they were the subject of an interesting article in the 'Engineer' of May 31, which asserts that the whole assembly heard the microphone speak, and that its voice was very like that of the phonograph. When the meeting was informed that these words had been uttered at some distance from the microphone, the Duke of Argyll, who was present, while admiring the important discovery, could not help exclaiming that Fig. 50. this invention might have terrible consequences, since, for instance, if one of Professor Hughes's instruments were placed in the room in Downing Street, in which Her Majesty's ministers hold their cabinet council, their secrets might be heard in the room in which the present meeting took place. He added that if one of these little instruments were in the pocket of Count Schouvaloff, or of Lord Salisbury, we should at once be in possession of the secrets for which all Europe was anxiously waiting. If these instruments were able to repeat all the conversations held in the room in which they stood, they might...

General

Imprint: Rarebooksclub.com
Country of origin: United States
Release date: July 2012
First published: July 2012
Authors: Thodore Achille L. Du Moncel • Theodore Achille L. Du Moncel
Dimensions: 246 x 189 x 5mm (L x W x T)
Format: Paperback - Trade
Pages: 96
ISBN-13: 978-1-150-02189-3
Barcode: 9781150021893
Categories: Books
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LSN: 1-150-02189-6

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