Ball, W. W. Rouse (Walter William Rouse), 1850-1925 · London, Macmillan · leaf 474
ount of this sun-dial with a diagram was given in Knowledge^ London,July 1, 1892, pp. 133, 134. t See Ozanam, 1803 edition, vol. iii, p. 317; 1810 edition, p. 526. CH. XX] TIME AND ITS MEASUREMENT 4.33 adjustment for the time of year is made as follows. The rimsbetween which the band can slide are… … For determining times near noon the instrument is reliable,but for other hours in the day it is accurate only if the timeof year is properly chosen, usually near one of the equinoxes.This defect may be corrected by marking the hours on acurved brass band affixed to the concave surface of the rims.I…
Geometry · Cryptography · Ciphers
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