Hinks, Arthur R. (Arthur Robert), 1873-1945 · Cambridge : University press · leaf 130
ound, A, B, C,D, E, and F, disposed so as to form the triangles of our figure, of which, itwill be observed, no one has a very acute angle. Each point must be visiblefrom the other points of the triangles to which it belongs ; but it is not at allnecessary that all the points should be… … The theodolite is set up over each peg in turn, the signal being removedif necessary, and the angles in the triangles are measured. Each triangleis checked by the necessity that the sum of its angles should differ from180° only by the small quantities which may be allowed as errors ofobservation.…
Maps · Surveying
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