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Więcej informacji o Report on Telegraphs and Apparatus (Classic Reprint)

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Excerpt from Report on Telegraphs and Apparatus Relays; Method of connection up the Morse circuit; Morse's register; The Nk-writer; Hughes printer; Belgian lines; Their apparatus and material; Automatic telegraphs; Double transmission. 1. Relays. - The original relay of Professor Morse was wound with No.14 copper wire, covered with cotton, and weighed one hundred and eighty pounds. The magnetic effect of this construction, owing to the comparatively few convolutions obtainable with such coarse wire, was very feeble. The French, however, shortly effected a considerable improvement in the construction of the relay by employing a smaller core and winding the same with a fine wire covered with silk. The cores of most of the instruments used in Europe at the present time are about four inches in length and of less than three-eighths of an inch in diameter, and are wound with a fine silk-covered wire, affording a sufficient number of layers or convolutions to give to the spool a diameter of one and one-eighth inches. The spools of the relay are longer, and smaller in diameter, than is the case with the form of this instrument generally in use in the United States. The advantages derived from the use of cores of such construction may be briefly stated to be as follows: First. Greater attractive force as a magnet is obtained. Second. A greater number of convolutions are obtained in proximity to the core. Third. The winding of the spool, not being attended by any considerable increment to its diameter or thickness, the outer convolutions add less resistance; and as a necessary consequence of the second specification, being nearer to the core, they give greater magnetic effect. Fourth. Such relays have much lighter armatures than the American. Fifth. As the result of this difference in construction, the relay is worked by a much less battery-power. 2. It is probable that the firm of Siemens Bros., London, and of Siemens & Halske, Berlin, make by far the greater number of the relays in use in Europe. It has for years been the custom of these makers to mark on the end of the spool of each of their instruments, the resistance of the spool in Siemens units, as also the number of convolutions of silk-covered wire which each contains. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.

Szczegóły książki

Kategoria Książki po angielsku Technology, engineering, agriculture Electronics & communications engineering Electronics engineering

• Pełny tytuł: Report on Telegraphs and Apparatus (Classic Reprint)
• Autor: David Brooks
• Język: Angielski
• Oprawa: Miękka
• Liczba stron: 52
• EAN: 9781332189212
• ISBN: 9781332189212
• ID: 09824986
• Wydawca: Forgotten Books
• Waga: 82 g
• Wymiary: 229 × 152 × 3 mm
• Data wydania: 04. August 2015

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