Postscript.
217
anything wrong having been detected. About two months
after the shock Mr. Prince had occasion to search for the
planet Mercury in the usual way, by means of the position-
circles. To his surprise the planet did not appear in the
field after the necessary position had been secured, and he
Fig. 18.—The Crowborough Equatorial.
then searched for Venus, with a similar result; and finally
he tried to find a star of known position, and also failed.
Suspecting that his instrument had got out of adjustment he
examined the base, and found that the telescope had been