Willson, Robert Wheeler, 1853-1922 · Boston, New York Ginn & company · leaf 86
e equatorial in-strument, and steadiness,strength, and ease of ma-nipulation are very uiuchincreased by constructingit as shown in Fig. 40,which represents a verysmall instrument built onthe plan of the meridiancircle of the fixed observ-atory. The strong hori-zontal axis revolves intwo Ys, which… … Fig. 40 ;s at right 74 LABORATORY ASTRONOMY perpendicular to the axis of rotation. If the axis of the telescopeis perpendicular to the axis of rotation, and if the latter is adjustedhorizontally east and west, the telescope may be brought into anyposition of the meridian plane, but must always be…
Astronomy
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