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The elements of theoretical and descriptive astronomy, for the use of colleges and academies (1901)

White, Charles J. (Charles Joyce), 1839-1917 · New York, J. Wiley & sons; · leaf 40

An illustration from The elements of theoretical and descriptive astronomy, for the use of colleges and academies, 1901, leaf 40 — , placinghis eye at A, sees theimage of the divisionsof the graduated circleMX, formed at D, thecommon focus of theglasses A and C. Hewill also see a scaleof notches, nn, andtwo intersecting spiderthreads, as shown inFig. 9. These threadsare attached to a slidingframe, aa, which ismoved by means of… … N Fig. 8.

Astronomy

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