Lockyer, Norman, Sir, 1836-1920, Seabroke, G. M. (George Mitchell), 1848-1918 · London, Macmillan and co. · leaf 378
a practised ej e often difier, inter CHAP. XXIV.] ORDINARY WORK OF THE EQUATORIAL. 355 se, more than would be thought possible. In measuring-distances we have supposed for sim^^licity that we find thedistance that one wire has to be moved from coincidencewith the fixed wire from one point to… … FiG. 159. — How the Length of a Shadow thrown hy a Lmiar Hill is rnea.sured. screw head divided by llie number of divisions corre-sponding to 1 will give the distance of the points inseconds of arc. But in practice it is unnecessary to adjustthe head to o when the wires coincide, and the…
Astronomy · Telescopes
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