A text-book of general astronomy : for colleges and scientific schools (1888)
Young, Charles A. (Charles Augustus), 1834-1908 · Boston ; London : Ginn & Company · leaf 401
Fig. 193. — American Apparatus for Photographing the Transit of Venus. plate was suspended a plumb-line of fine silver wire, the image of whichappeared upon the plate, and gave the means of determining the orientation of the image with extremeprecision. If the reflec-tor were, and would con-tinue…
Astronomy
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