 | John Fry Heather - 1859 - 198 pages
...deduced severally from such observations, will be the true latitude ; but in these there should be no application of index error, for that being constant,...of the index, it must be removed, for the time, by takine out the finger screw, which fastens it to the body of the circle. " If it should happen that... | |
 | 1860 - 936 pages
...errors, be less distinct than the latter. "In taking distances, when the position does not тагу from the vertical above thirty or forty degrees, the...of the index, it must be removed, for the time, by taking out the finger screw which fastens it to the body of the circle. . " If it should happen that... | |
 | 1835 - 596 pages
...the latter. " In taking distances, when the position does not vary from the vertical above 30 or 40 degrees, the handles which are attached to the circle...reading one of the branches of the index, it must ba removed for the lime by taking out the finger screw which fastens it to the body of the circle.... | |
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... of them, those which apply to the eye-end of the telescope will answer much better ; the former having their errors magnified by the power of the telescope, will, in proportion to this power, and those errors, be less distinct than the latter. " In... 
