Excerpt from Astronomical Observations Made at the Observatory of Cambridge, Vol. 4: For the Year 1831 The focal length of the Transit Instrument with which the following observations were made is nearly 10 feet, ' and its full aperture 5 inches. The power commonly used is about 140. The wires are of silk fibres their thickness is less than 0' - 0 - 0 of an inch, and they subtend an angle of less than The screws which move the whole system of wires (for removing the error of collimation) have never been used after the ...
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Excerpt from Astronomical Observations Made at the Observatory of Cambridge, Vol. 4: For the Year 1831 The focal length of the Transit Instrument with which the following observations were made is nearly 10 feet, ' and its full aperture 5 inches. The power commonly used is about 140. The wires are of silk fibres their thickness is less than 0' - 0 - 0 of an inch, and they subtend an angle of less than The screws which move the whole system of wires (for removing the error of collimation) have never been used after the wires were fixed, but the. Error of collimation has been repeatedly measured. It will be seen in Section 11. That it has had no perceptible variation. A micrometer wire parallel to the fixed wires is moved by a screw, one turn of which corresponds to of space, nearly. This wire is intended for observations of Polaris and sursae Minoris, being placed successively in positions differing by l, 2, 3 turns of the screw from the position in which it exactly coincides with the middle wire, and thus discharging the office of several wires at small distances. It is also used to measure the distance of the middle wire from a distant mark or the wire of a collimating telescope nearly in the meridian. In all these applications the reading of the micrometer head, at coincidence of the micrometer wire with the middle wire, is found by making it touch that wire six times, alternately on the two sides, and taking the mean of all the readings. The middle wire does not coincide with the mean of the seven wires and this difference is generally taken into account by using, in the reduction of the transits, a different value for the error of collimation. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at ... 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.
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