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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 — N Fig. 8. … Fig. 9. the threads of the screw, thus making the number of teeth passedover by the spider threads equal to the number of complete re-volutions made by the screw. The central notch is taken as thepoint of reference, and is distinguished by a hole opposite to it.There is a fixed index at i, to which…

Astronomy

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