Herschel, John F. W. (John Frederick William), Sir, 1792-1871 · London : Longman, Rees Orme · leaf 110
e glasswhile another object, P, is seen through die same tele-scope by rays, which, after reflexion at C, have beenthrown upon the silvered part of D, and are thencedirected by a second reflexion into the telescope. Thetwo images so formed will both be seen in the field ofview at once, and by… … n 4 104 A TREATISE OS ASTRONOMY. CHAP. II. point the angle included between the direction C P of oneobject, and FQ of the other, is twice the angle ECBincluded between the fixed and moveable radii CB, CE.Now, the graduations of the limb being purposely madeonly half as distant as would correspond…
Astronomy
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