 | Frederick Walter Simms - 1834 - 124 pages
...however, they happen to get out of order, and the observer wishes to correct them, it is done by loosening the screws which hold the eye-end of the telescope in its place, and turning the end round a small quantity by the hand until the error is removed. But this operation requires... | |
 | Nathaniel Bowditch - 1846 - 854 pages
...however, they happen to get out of order, and the observ« wishes to correct them, it is done by loosening the screws which hold the eye-end of the telescope in its place, and turning the end round a small quantity, by the hand, until the error is removed. But this operation... | |
 | Benjamin Pike - 1848 - 356 pages
...however, they happen to get out of order, and the observer wishes to correct them, it is done by loosening the screws which hold the eye-end of the telescope in its place, and turning the end round a small quantity by the hand until the error is removed. But this operation requires... | |
 | Benjamin Pike (Jr.) - 1848 - 482 pages
...however, they happen to get out of order, and the observer wishes to correct them, it is done by loosening the screws which hold the eye-end of the telescope in its place, and turning the end round a small quantity by the hand until the error is removed. But this operation requires... | |
 | Sir Henry Edward Landor Thuillier - 1851 - 826 pages
...its position, the axis is horizontal, but, if not, it must be brought back half by the foot screw, f, and the other half by turning the small screw at one...till the error is removed. Lift the transit off the Y's, and reverse it, so that the end of the axis, which was upon the eastern Y, may now be upon the... | |
 | John Fry Heather - 1859 - 198 pages
...stand upon the pivots, in which case it is called a striding level, or of the form shown at page 96, in which case it is suspended from the pivots, and...turn the end round very carefully till the error is moved. Lift the transit off the Ys, and reverse it, so that the end of the axis, which was upon the... | |
 | 1860 - 936 pages
...object, and bisect it by one extremity of the middle vertical wire, giving the telescope the azimnthal motion necessary for this purpose by turning the screw...screws which hold the eye-end of the telescope in its placo, and turn the end round very carefully till the error is removed. Lift the transit off the Y'S,... | |
 | John Fry Heather - 1866 - 228 pages
...by the foot screw,/, and the other half by turning the small screw at one end of the level. Kepeat the operation till the bubble retains the same position...turn the end round very carefully till the error is moved. Lift the transit off the Ys, and reverse it, so that the end of the axis, which was upon the... | |
 | George Frederick Chambers - 1867 - 888 pages
...depress the telescope to see whether the object still remains bisected in every part by the middle wire ; if not, loosen the screws which hold the eye-end of...in its place, and turn the end round very carefully until the error is removed. Lift up the whole instrument bodily from the \'s and reverse it, end to... | |
 | John Fry Heather - 1874 - 220 pages
...Collimation in Azimuth. — Direct the telescope to some distant, small, and well-defined object, and insect it by one extremity of the middle vertical wire, giving...turn the end round very carefully till the error is moved. Lift the transit off the Ys, and reverse it, so that the end of the axis, which was upon the... | |
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Repeat the operation till the bubble retains the same position in both positions of the level, and the axis will be horizontal. To adjust the Line of Collimation in Azimuth. — Direct the telescope to some distant, small, and well-defined object, and... 
