Astronomy, a handy manual for students and others (1918)
Dyson, Frank Watson, Sir, 1868-1939 · New York, E.P. Dutton & Co. · leaf 93
ith a heliometer. This is a telescope equatori-ally mounted, but having its object glass divided intotwo halves. The two halves can be moved, as shownin Diagram XLIV, by means which admit of thedistance from the central position being accuratelydetermined. Each half gives a picture of the partof… … 82 ASTRONOMY and the glass is turned so that the direction in whichthe halves are separated is parallel to the line joiningthe stars, there will be seen, as in Diagram XLIV, four images in a straight line,viz. A and B, the images ofthe two stars formed byone half of the glass, andA; B7, the images…
Astronomy
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