Jones, H. Spencer (Harold Spencer), 1890- · London E. Arnold & co. · leaf 204
e of the field. Agraduated cu-ole is fixed to the axis and rotates with it,enabling the instrument to be set on a star of any reqmreddechnation. The observation of a transit consists in the determinationof the times that the star image passes across each verticalwire ; this may be done by the… … Fig. 60.—Schematic TransitInstrument. 172 GENERAL ASTRONOMY and more accurate to record these times electrically, with theaid of a chronograph. For this pm-pose a hand tapper maybe used, but the most modern method is to use a self-recordingmicrometer. This carries a second frame on which is…
Astronomy
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