The elements of theoretical and descriptive astronomy, for the use of colleges and academies (1872)
White, Charles J. (Charles Joyce), 1839-1917 · Philadelphia, Claxton, Remsen & Haffelfinger · leaf 36
f we divide this difference by the numberof the days and parts of days wrhich have intervened betweenthe two observations, the quotient wrill be the daily gain orloss. 22. Chronograph.—The accuracy of astronomical observationsi& much enhanced by recording the times of the observations bymeans… … Pig. 5. THE TRANSIT INSTRUMENT. 31 down upon the paper, and is so connected with a battery thai,whenever the circuit is broken a mark of some kind is made uponthe paper. The wires of this battery are connected with thesidereal clock in such a way that every oscillation of the pendu-lum breaks the…
Astronomy
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