Young, Charles A. (Charles Augustus), 1834-1908, Young, Anne Sewell, b. 1871., ed · Boston, New York [etc.] Ginn and Company · leaf 432
Fig. 148. — The Filar Position-Micrometer. … Fig. 149. — Construction of the Micrometer. movable wire points from one star to another in the field ofview, the position angle is then read off on the circle, A. With such a micrometer we can measure at once the distancein seconds of arc between any two stars which are near enough § 542] THE…
Astronomy · Constellations
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