Lockyer, Norman, Sir, 1836-1920 · London : Macmillan and Co. · leaf 280
measuredbv the number of revolutions and parts of a revolutionof this screw, each revolution being divided into a thou-sand parts by a small circle outside the body of themicrometer, which indicates o when the moveable andcentral wire are coincident, and at each complete revo-lution on either side… … Portable Altazimuth Instrument- DETERMINA TION OF POSITIONS. 247 Attached to the micrometer, or to the eye-piece whichcarries it, is also a position-circle, divided into 360°; b>this the angle made by the line joining two stars, forinstance, with the direction of movement across the fieldof…
Astronomy · Solar system
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