Lockyer, Norman, Sir, 1836-1920, Seabroke, G. M. (George Mitchell), 1848-1918 · London, Macmillan and co. · leaf 376
e two wires, CHAP. XXIV.] ORDINARY WORK OF THK EgUATOKIAL. 3o3 being parallel to the stars motion, will represent twojiarallels of declination; and we use the direction of theparallels of declination to determine the datum point atright angles to them, that is, the north point of thefield. We have… … Fig. 158.—Po.sitioii CJiicle. object at the central point it will be preceded and fol-lowed by those in the various quadrants. The movablewires lie on meridians and the fixed ones on parallelswhen adjusted as above. The position circle is often attached to, and formspart of, the micrometer instead…
Astronomy · Telescopes
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