Description and Instructions for the Use of the Aberdeen Chronograph (Classic Reprint) download ebook
Description and Instructions for the Use of the Aberdeen Chronograph (Classic Reprint) download ebook
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Author: Unknown Author
Page Count: 52 pages
Published Date: 27 Sep 2015
Publisher: Forgotten Books
Publication Country: United States
Language: English
ISBN: 9781332229420
File size: 18 Mb
File Name: Description.and.Instructions.for.the.Use.of.the.Aberdeen.Chronograph.(Classic.Reprint).pdf
Download Link: Description and Instructions for the Use of the Aberdeen Chronograph (Classic Reprint)
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Excerpt from Description and Instructions for the Use of the Aberdeen Chronograph This chronograph was developed at the Aberdeen Proving Ground during 1918 and so constructed that the time taken for a projectile to pass over a measured path may be read upon a scale directly from the record strip. The measured path referred to is the distance between two sheet tin screens placed fifty feet apart in front of the gun. Wires are lad from these screens to the chronograph and the record is obtained by an electric spark which functions at the instrument when the projectile passes through the screen. The chronograph measures the time Interval between these two sparks as follows: A drum (Plate I) of known circumference(500 m/m) is rotated by a governed electric motor at a constant speed(25 revolutions per second). On the interior surface of this drum is carried a record strip of prepared paper which is held in position by centrifugal force. The linear velocity of this strip is 500 m/m x 26 r.p. s., or 12500 m/m per second. When the projectile passes through the first screen a spark jumps from the top spark point (Plate I), through the record strip, to the drum, perforating the paper strip. The drum continues to revolve and when the projectile reaches the second screen a spark perforates the paper from a lower sparking point. The motor is then stopped, the strip removed and the distance between these two spark punctures measured, which gives the lime the projectile took to pass from the first to the second screen. 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.
Read online Description and Instructions for the Use of the Aberdeen Chronograph (Classic Reprint) Buy and read online Description and Instructions for the Use of the Aberdeen Chronograph (Classic Reprint) Download Description and Instructions for the Use of the Aberdeen Chronograph (Classic Reprint) ebook, pdf, djvu, epub, mobi, fb2, zip, rar, torrent Download to iPad/iPhone/iOS, B&N nook Description and Instructions for the Use of the Aberdeen Chronograph (Classic Reprint)
Description and Instructions for the Use of the Aberdeen Chronograph (Classic Reprint) by Unknown Author
Author: Unknown Author
Page Count: 52 pages
Published Date: 27 Sep 2015
Publisher: Forgotten Books
Publication Country: United States
Language: English
ISBN: 9781332229420
File size: 18 Mb
File Name: Description.and.Instructions.for.the.Use.of.the.Aberdeen.Chronograph.(Classic.Reprint).pdf
Download Link: Description and Instructions for the Use of the Aberdeen Chronograph (Classic Reprint)
---------------------------------------------------------------
Excerpt from Description and Instructions for the Use of the Aberdeen Chronograph This chronograph was developed at the Aberdeen Proving Ground during 1918 and so constructed that the time taken for a projectile to pass over a measured path may be read upon a scale directly from the record strip. The measured path referred to is the distance between two sheet tin screens placed fifty feet apart in front of the gun. Wires are lad from these screens to the chronograph and the record is obtained by an electric spark which functions at the instrument when the projectile passes through the screen. The chronograph measures the time Interval between these two sparks as follows: A drum (Plate I) of known circumference(500 m/m) is rotated by a governed electric motor at a constant speed(25 revolutions per second). On the interior surface of this drum is carried a record strip of prepared paper which is held in position by centrifugal force. The linear velocity of this strip is 500 m/m x 26 r.p. s., or 12500 m/m per second. When the projectile passes through the first screen a spark jumps from the top spark point (Plate I), through the record strip, to the drum, perforating the paper strip. The drum continues to revolve and when the projectile reaches the second screen a spark perforates the paper from a lower sparking point. The motor is then stopped, the strip removed and the distance between these two spark punctures measured, which gives the lime the projectile took to pass from the first to the second screen. 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.
Read online Description and Instructions for the Use of the Aberdeen Chronograph (Classic Reprint) Buy and read online Description and Instructions for the Use of the Aberdeen Chronograph (Classic Reprint) Download Description and Instructions for the Use of the Aberdeen Chronograph (Classic Reprint) ebook, pdf, djvu, epub, mobi, fb2, zip, rar, torrent Download to iPad/iPhone/iOS, B&N nook Description and Instructions for the Use of the Aberdeen Chronograph (Classic Reprint)