A treatise on surveying and navigation: uniting the theoretical, practical, and educational features of these subjects (1857)
Robinson, Horatio N[elson], 1806-1867. [from old catalog] · Cincinnati, J. Ernst; Toledo, Anderson, Burr, & co. · leaf 205
eflecting surface,and a ray of light, SB, from any celestialobject S, were reflected to an eye at F, theimage of the object would appear at S onthe other side of the plane, the angles SB Aand ABS, as well as FBC, being equal;and if FB bear no sensible proportion tothe distance of S, the angles SFS… … LEMMA. If the exterior angle of a triangle he bisected, and also one of theinterior opposite angles, and the bisecting lines produced until theymeet, the angle so formed will be half the other interior opposite angle. Let AB C be the triangle, and bisect the exterior angle A CDby the line CF, and…
Surveying · Navigation
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