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
pera-tion, the method couldnot fail to give extremelyaccurate results; but themeasurements and discus-sion of the observationsseem to show that thismirror was actually dis-torted to a considerableextent by the rays of thesun. On the whole theAmerican plates do notappear to be much moretrustworthy… … GRAVITATIONAL METHODS. 389 is the image of a metal disc cemented to the reticle to mark the centre linesof the reticle plate; 192 plates were taken during the transit, and at some ofthe stations where the weather was good the number was much greater—nearly 300 in some cases. The difficulties to be…
Astronomy
Internet Archive · Wellesley College Library · Public Domain Mark 1.0. Free to use for anything.
