Searchlights And Signal Lights
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Searchlights And Signal Lights
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Author :
language : en
Publisher:
Release Date : 2015-08-05
Searchlights And Signal Lights written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015-08-05 with Technology & Engineering categories.
Excerpt from Searchlights and Signal Lights: For the Instruction of Officers and Personnel Connected With Searchlights The first use of any light projector which could be called a searchlight in any sense of the word was on board a Union warship blockading a southern port during the Civil War. On a dark night a Confederate ship attempted to run the blockade, thinking herself secure against detection on account of the blackness of the night. Suspicion, however, was aroused on board the Union ship and the first searchlight used at sea was brought into use. From the Union ship there came a feeble, poorly reflected, widely divergent beam of light. It swung around, searching for the enemy, and finally, faintly illuminated, he was discovered. Crude as was this searchlight, it made a place in warfare for the projector which has since been developed to a remarkable degree of efficiency. This first searchlight was merely a "limelight" produced by playing an oxy-hydrogen flame on a candle of calcium oxide, this source of light being backed by a crude, spherical, polished metal mirror which absorbed about 50 percent of the total light. Shortly after this came the first arc light, which, when used with small, spherical metal mirrors, was useful up to a maximum range of perhaps 300 yards. The next military use of searchlights was at the siege of Paris (1870-71) in which arc lights were used. They burned vertically and the entire arc and flame was used as the source of light, rather than using, as is the present practice, only the very brilliant positive crater. The arc current was about 10 amperes. This light was mounted behind a rather expensive and complicated system of lenses and prisms invented by Fresnel. It had previously found application in lighthouses, and because of the good results obtained by this system in that service, it was tried on searchlights. However, on account of its complication, expense, and low efficiency, it could not stand in the face of later inventions. In 1876, Col. Mangin brought out his silvered glass reflector which gave excellent results and was the forerunner of modern searchlight mirrors. For a long time it had been recognized that a parabolic silvered glass mirror would be the best reflector obtainable, but at that time it was impossible to grind one. Spherical mirrors were useless because of unavoidable distortion of the beam. Mangin's reflector consisted of a mirror with its front surface and back surface spherical, but with different radii and not concentric. This corrected spherical aberration. So successful was this mirror that it still finds a fairly wide application for small lights. 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.
Searchlights And Signal Lights For The Instruction Of Officers And Personnel Connected With Searchlights
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Author : United States. Navy Department. Bureau of Engineering
language : en
Publisher:
Release Date : 1918
Searchlights And Signal Lights For The Instruction Of Officers And Personnel Connected With Searchlights written by United States. Navy Department. Bureau of Engineering and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1918 with Searchlights categories.
Searchlights And Signal Lights For The Instruction Of Officers And Personnel Connected With Searchlights
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Author : United States Navy Dept Bureau of E
language : en
Publisher: Legare Street Press
Release Date : 2023-07-18
Searchlights And Signal Lights For The Instruction Of Officers And Personnel Connected With Searchlights written by United States Navy Dept Bureau of E and has been published by Legare Street Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2023-07-18 with History categories.
A comprehensive guide for officers and personnel involved with searchlights, featuring detailed instructions and diagrams. This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work is in the "public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.
Instructions For The Operation Care And Repair Of Searchlights
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Author : United States. Navy Department. Bureau of Engineering
language : en
Publisher:
Release Date : 1925
Instructions For The Operation Care And Repair Of Searchlights written by United States. Navy Department. Bureau of Engineering and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1925 with Searchlights categories.
Operator S And Organizational Maintenance Manual Including Repair Parts And Special Tools Lists
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Author :
language : en
Publisher:
Release Date : 1970
Operator S And Organizational Maintenance Manual Including Repair Parts And Special Tools Lists written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1970 with Searchlights categories.
Type Sc Color Light Signal
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Author : General Railway Signal Company
language : en
Publisher:
Release Date : 1946
Type Sc Color Light Signal written by General Railway Signal Company and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1946 with Railroads categories.
Classic Railroad Signals
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Author : Brian Solomon
language : en
Publisher: Voyageur Press (MN)
Release Date : 2015-05-08
Classic Railroad Signals written by Brian Solomon and has been published by Voyageur Press (MN) this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015-05-08 with History categories.
Classic Railroad Signals digs into nearly every piece of train signaling hardware with archival and modern photos showing signals from around America.
Signalman 3 2
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Author : Vincil T. Clark
language : en
Publisher:
Release Date : 1982
Signalman 3 2 written by Vincil T. Clark and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1982 with categories.
The Signalman S Journal
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Author :
language : en
Publisher:
Release Date : 1950
The Signalman S Journal written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1950 with Labor unions categories.
History Of Communications Electronics In The United States Navy
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Author : Linwood S. Howeth
language : en
Publisher:
Release Date : 1963
History Of Communications Electronics In The United States Navy written by Linwood S. Howeth and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1963 with Communications, Military categories.