 | Frederick Walter Simms - 1834 - 134 pages
...cylindrical rings on which the telescope turns : it is known to be correct, when an eye looking through the telescope observes their intersection continue on...usual method of making this adjustment is as follows : denee of the wire and object remains perfect in both positions of the telescope, the line of collimation... | |
 | Sir J. Butler Williams - 1846 - 368 pages
...vertically. This adjustment is effected as follows: — Make the intersection of the cross wires to coincide with some well-defined part of a distant...half round in its Y's, till the level lies above it ; if the same point be not then covered by the centre of the wires, move this centre one-half of the... | |
 | Basil Jackson - 1847 - 410 pages
...the theodolite on its legs, and direct the telescope so that the centre of the horizontal hair shall coincide with some well-defined part of a distant object ; then turn the telescope in the Ys till the level is uppermost : observe then whether the horizontal hair still coincides with... | |
 | P. O'Shaughnessy (Civil engineer) - 1848 - 110 pages
...the rings on which the -telescope turns : it is known to be correct, when an eye looking through the telescope observes their intersection continue on...during an entire revolution of the telescope. The following is the method of making this adjustment : First, make the centre of the horizontal wire coincide... | |
 | Frederick Walter Simms - 1850 - 184 pages
...cylindrical rings on which the telescope turns : it is known to be correct, when an eye looking through the telescope observes their intersection continue on...level lies above it, and observe if the same point be again cut by the centre of the wire, — if not, move the wire one half the quantity of deviation,... | |
 | Sir Henry Edward Landor Thuillier - 1851 - 826 pages
...cylindrical rings on which the telescope turns : it is known to be correct, when an eye, looking through the telescope, observes their intersection continue on...the centre of the horizontal wire coincide with some well defined part of a distant object ; then turn the telescope half round in its Y's till the level... | |
 | W. Davis Haskoll - 1858 - 422 pages
...question. To adjust the line of collimation. " First make the intersection of the horizontal wires coincide with some well-defined part of a distant object, then turn the telescope half round in its ' y-»- till the level lies above it, and observe if the same point is again cut by the centre of the... | |
 | William Davis Haskoll - 1868 - 252 pages
...and also of the cross hairs of the diaphragm. We may now see about the actual line of collimation. First, make the centre of the horizontal wire coincide with some well-defined and motionless point in a distant object ; then turn the telescope half round in its Y'S, till the... | |
 | R. R. Hodgson - 1881 - 136 pages
...air bubble of the level remain in the centre of the glass or tube, when an eye looking through the telescope observes their intersection continue on the same point of a distant object during its entire revolution. 235. Set the instrument as nearly level as can be done by the eye, then fasten... | |
 | William Davis Haskoll - 1886 - 354 pages
...and also of the cross hairs of the diaphragm. We may now see about the actual line of collimation. First, make the centre of the horizontal wire coincide with some well.defined and motionless point in a distant object ; then turn the telescope half round in its Y'S, till the... | |
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The Adjustments. The first adjustment is that of the line of collimation, — that is, to make the intersection of the cross wires coincide with the axis of the cylindrical rings on which the telescope turns : it is known to be correct, when an eye looking... 