The elements of theoretical and descriptive astronomy, for the use of colleges and academies (1872)
White, Charles J. (Charles Joyce), 1839-1917 · Philadelphia, Claxton, Remsen & Haffelfinger · leaf 41
rcle. When any angle is to be measured, the readings ofall four microscopes are first taken. The telescope, carrying thecircle with it5 is then moved through the angle whose value isrequired, and the new readings of the microscopes, which haveremained stationary, are taken. We thus obtain four… … Fig. 8. 28. The Reading Microscope.—The reading microscope iarepresented in Fig. 8.The observer, placinghis eye at A, sees theimage of the divisionsof the graduated circleMN, formed at D, thecommon focus of theglasses A and C. Hewill also see a scaleof notches, nn, andtwo intersecting…
Astronomy
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