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The elements of astronomy; a textbook (1919)

Young, Charles A. (Charles Augustus), 1834-1908, Young, Anne Sewell, b. 1871., ed · Boston, New York [etc.] Ginn and Company · leaf 432

An illustration from The elements of astronomy; a textbook, 1919, leaf 432 — fork carriesone or more wires parallelto the first set, so that thedistance between the wirese and d, Fig. 149, can beadjusted at pleasure and read off by means ofthe scale that is shownand the screw-head grad-uation. The box, B, Fig.148, containing the wiresand micrometer, is so ar-ranged that it… … Fig. 148. — The Filar Position-Micrometer.

Astronomy · Constellations

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