A Dictionary of science, literature, and art [electronic resource]: comprising the history, description, and scientific principles of every branch of human knowledge; with the derivation and definition of all the terms in general use (1844)
Brande, William Thomas, 1788-1866, Cauvin, Joseph · New York : Harper & brothers · leaf 1270
observing the same stars from day to day theclock rate is determined, in this manner we are enabledto assign the exact interval of sidereal time between thetransits of the different stars, and consequently the differ-ence of their right ascensions. For determining the abso-lute place of a celestial… … The foregoing diagram represents the portable transit in-strument, as at present constructed by Troughton andSimms, when the telescope does not exceed twenty inchesor two feet in focal length. The telescope tube A A is intwo parts, connected together by a sphere B, which also re-ceives the larger…
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