A treatise on surveying ; in which the theory and practice are fully explained (1860)
Alsop, Samuel · Philadelphia, E. C. & J. Biddle & co. · leaf 49
AH in B, E, C, F,the arc BC will have to the cir-cumference BCD the same ratioas EF has to the circumferenceEFG. In the measurement ofangles, it is a matter of indif-ference, therefore, what radius isassumed as that of the circle of reference. The radiuswhich is generally adopted is unity. This… … Fig. 32. 109. The complement of an arc orangle is what it differs from a quad-rant, or 90°. Thus, DB (Fig. 32) isthe complement of AB, and MD ofAM.
Surveying
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