This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1868 Excerpt: ... mounting of the object-glass of the Heliometer, and of the mode of reading its scale, will enable any person easily to follow the columns of the printed observations of double stars and planets. It has been the practice to read the scale for measures of distance of a double star three times in one position of the ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1868 Excerpt: ... mounting of the object-glass of the Heliometer, and of the mode of reading its scale, will enable any person easily to follow the columns of the printed observations of double stars and planets. It has been the practice to read the scale for measures of distance of a double star three times in one position of the moveable image with regard to the fixed image (the four images being brought into line at equal distances), and then, after reading the position-circle, to read the scale for three separate measures with the moveable image on the other side of the fixed image, after turning the telescope so as to bring the objects accurately into line again. The position-circle is then read a second time. The differences between the mean of all the readings for a star (which is generally taken for the zero) and the separate readings, give six separate measures of distance, which are set down in the sixth column of the printed observations. The value in arc of one division of the scale which has been used in the reduction of the observations, namely 2c/--424, is the same as that used in preceding years; and its correctness is proved by the following observations made in the autumn of 1865. 1865, Sept. 19. Transits of the two images of Cephei 51 (Hev.) S.P. The position-circle was set to the reading which corresponds to the equatorial position of the line of separation of the two halves of the object-glass, and the micrometer eye-piece was turned round till the two images of the stars, placed at a considerable distance apart, were accurately on the usual transit-wire, and care was taken to observe that they ran accurately by the diurnal motion along the wire. Transits of both images were then taken over the declination-wire, and the micrometer-wire placed at a small...
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Add this copy of Astronomical and Meteorological Observations Made at to cart. $61.07, good condition, Sold by Bonita rated 4.0 out of 5 stars, ships from Newport Coast, CA, UNITED STATES, published 2016 by Palala Press.
