Read History and Description of Mr. Tebbutt s Observatory: Windsor, New South Wales (Classic Reprint)

History and Description of Mr. Tebbutt s Observatory: Windsor, New South Wales (Classic Reprint)

John Tebbutt

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Description:Excerpt from History and Description of Mr. Tebbutt's Observatory: Windsor, New South Wales The reduction for a complete observation of an equatorial star at the upper culmination, clamp east, is therefore 0 070s. The threads are illuminated by a lamp standing on a shelf near one of the pivots. The light falling on a lens in one of the pivots passes down the hollow conical axis of the transit and is brought to a focus on a small re ector in the middle of the central cube, thence it proceeds down the tube to the transit system. The piers of the equatorial and transit-instruments are substantial, and are remarkably free from sudden uctuations of level consider ing the nature of the foundation, which consists of clay and loam. Both piers are built on a substratum of pitch and tar to prevent the rise of damp. It is remarkable that from April, 1882, to May, 1885, the eastern pivot of the transit instrument gradually rose, so that on several occasions during that period it was found necessary to lower the pivot in order to keep the inclination within measureable limits. The following is a record of the adjustments made: - April 29, 1882, 133; June 15, 1882, September 14, 1883, February 26, 1884, April 8, 1884, 1238; July 31, 1884, 56; January 30, 1885, March 14, 1885, April 23, 1885, May 12, 1885, Their sum is Subsequently to the last men tioned date the western pivot has been on the whole rising. Thinking these changes might be due to a general oscilla tion of the hill on which the Observatories stand, I made a series of simultaneous observations of the levd errors of the two transit-instruments, the one in the old and the other in the new Observatory. Although the changes of level in the two instruments followed the same law for a time they ultimately became discordant. The cause of change for each instrument must therefore be an immediate local one. 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."We have made it easy for you to find a PDF Ebooks without any digging. And by having access to our ebooks online or by storing it on your computer, you have convenient answers with History and Description of Mr. Tebbutt s Observatory: Windsor, New South Wales (Classic Reprint). To get started finding History and Description of Mr. Tebbutt s Observatory: Windsor, New South Wales (Classic Reprint), you are right to find our website which has a comprehensive collection of manuals listed.
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Description: Excerpt from History and Description of Mr. Tebbutt's Observatory: Windsor, New South Wales The reduction for a complete observation of an equatorial star at the upper culmination, clamp east, is therefore 0 070s. The threads are illuminated by a lamp standing on a shelf near one of the pivots. The light falling on a lens in one of the pivots passes down the hollow conical axis of the transit and is brought to a focus on a small re ector in the middle of the central cube, thence it proceeds down the tube to the transit system. The piers of the equatorial and transit-instruments are substantial, and are remarkably free from sudden uctuations of level consider ing the nature of the foundation, which consists of clay and loam. Both piers are built on a substratum of pitch and tar to prevent the rise of damp. It is remarkable that from April, 1882, to May, 1885, the eastern pivot of the transit instrument gradually rose, so that on several occasions during that period it was found necessary to lower the pivot in order to keep the inclination within measureable limits. The following is a record of the adjustments made: - April 29, 1882, 133; June 15, 1882, September 14, 1883, February 26, 1884, April 8, 1884, 1238; July 31, 1884, 56; January 30, 1885, March 14, 1885, April 23, 1885, May 12, 1885, Their sum is Subsequently to the last men tioned date the western pivot has been on the whole rising. Thinking these changes might be due to a general oscilla tion of the hill on which the Observatories stand, I made a series of simultaneous observations of the levd errors of the two transit-instruments, the one in the old and the other in the new Observatory. Although the changes of level in the two instruments followed the same law for a time they ultimately became discordant. The cause of change for each instrument must therefore be an immediate local one. 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."We have made it easy for you to find a PDF Ebooks without any digging. And by having access to our ebooks online or by storing it on your computer, you have convenient answers with History and Description of Mr. Tebbutt s Observatory: Windsor, New South Wales (Classic Reprint). To get started finding History and Description of Mr. Tebbutt s Observatory: Windsor, New South Wales (Classic Reprint), you are right to find our website which has a comprehensive collection of manuals listed.
Our library is the biggest of these that have literally hundreds of thousands of different products represented.

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History and Description of Mr. Tebbutt s Observatory: Windsor, New South Wales (Classic Reprint)

History and Description of Mr. Tebbutt s Observatory: Windsor, New South Wales (Classic Reprint)

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