 | Frederick Walter Simms - 1834 - 134 sider
...not parallel to the optical axis, and requires correcting. The end to which the bubble retires must be noticed, and the bubble made to return one-half the distance by the parallel plate-screws, and the other half by the capstan-headed screw at the end of the level,... | |
 | Benjamin Pike - 1848 - 356 sider
...not parallel to the optical axis, and requires correcting. The end to which the bubble retires must be noticed, and the bubble made to return onehalf the distance by the parallel plate-screws, and the other half by the capstan-headed screw at the end of the level,... | |
 | Benjamin Pike (Jr.) - 1848 - 482 sider
...not parallel to the optical axis, and requires correcting. The end to which the bubble retires must be noticed, and the bubble made to return onehalf the distance by the parallel plate-screws, and the other half by the capstan-headed screw at the end of the level,... | |
 | Thomas Baker - 1850 - 244 sider
...correcting. The end to which the bubble retires must then be noticed, and the bubble made to return one half the distance by turning the parallel plate screws, and the other half by turning the capstain headed screws at the end of the bubble tube. The telescope must now again be reversed, and... | |
 | Sir Henry Edward Landor Thuillier - 1851 - 826 sider
...should the bubble not settle at the same point of the tube as before, it shows that the bubble tube is out of adjustment, and requires correcting. The...turning the capstan-headed screw at the end of the bubble tube. The telescope must now again be reversed, and the operation be repeated, until the bubble... | |
 | Robert Thornton (Engineer.) - 1863 - 144 sider
...the air bubble not settle in the same place or point of the tube as before, it shows the bubble tube is out of adjustment, and requires correcting. The...must then be noticed, and the bubble made to return one half the distance by turning the parallel plate screws, and the other half by turning the capstan-headed... | |
 | Henry S. Merrett - 1863 - 428 sider
...true to the axis of the tube, and requires adjustment. The end to which the bubble of air goes must be noticed, and the bubble made to return one-half the distance by the parallel plate screws H, and the other half by the screw F. This and the adjustment for the collimation... | |
 | Henry S. Merrett - 1863 - 476 sider
...true to the axis of the tube, and requires adjustment. The end to which the bubble of air goes must be noticed, and the bubble made to return one-half the distance by the parallel plate screws H, and the other half by the screw F. This and the adjustment for the collimation... | |
 | Thomas Baker (C.E.) - 1865 - 174 sider
...should the bubble not settle in the same point of the tube as before, it shows that the bubble tube is out of adjustment, and requires correcting. The...parallel plate screws, and the other half by turning the capstain headed screws at the end of the bubble tube. The telescope must now again be-reversed, and... | |
 | John Fry Heather - 1884 - 566 sider
...correcting. The end to which the bubble retires must then be noticed, and the bubble made to return one -half the distance by turning the parallel plate screws,...bubble settles at the same point of the tube, in the centre of its run, in both positions of the instrument. The adjustment is then perfect, and the clips... | |
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... is out of adjustment, and requires correcting. The end to which the bubble retires must then be noticed, and the bubble made to return one.half the distance by turning the parallel plate screws, and the other half by turning the capstan.headed screw... 