A Dictionary of Science, Literature, and Art

A Dictionary of Science, Literature, and Art

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The foregoing diagram represents the portable transit-instrument, as at present constructed by Troughton and Simms, when the ... The standards DD are fixed by screws upon a brass circle F, which rests on three screws, b, c, d, forming the feet of the ... For the purpose of illuminating the wires when observations are made at night, one of the pivots is pierced, and ... One of the simplest is to observe two successive transits of Polaris (or any circumpolar star) above and below the pole.

Title:A Dictionary of Science, Literature, and Art
Author: William Thomas Brande
Publisher: - 1847

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