Elements of geometry for the use of schools (1854)
Ireland. Board of National Education · Dublin : A. Thom · leaf 65
ABC,taken on the ground. By means of thesemicircle or theodolite, let us ascertain thedegrees contained in the angles CAB, C B A,and let us transfer these angles to the paperby means of the Reporter. We shall havethe angles H F G, and H G F, respectivelyequal to C A B, and C B A. And because… … LXII. As it is of consequence, in practice, thatthe angles he exactly measured, we shouldnot trust entirely to the most accurate instru-ments. We must endeavour to find a methodof verifying these measurements, in order tocorrect them if necessary. This method is,however, as easy as it is simple.…
Geometry
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