A treatise on surveying ; in which the theory and practice are fully explained (1860)
Alsop, Samuel · Philadelphia, E. C. & J. Biddle & co. · leaf 45
ight angle,(31.3 ;) therefore, DB touches the circle, (16.3.) If the point were in the circumference at B. Join EB,and draw BD perpendicular to it. BD will be the tangent. Problem 7.— Through a given point to draw a line parallelto a given straight line. 97. First Method.—Let A (Fig. 21)be the… … Fig. 21. B E D 98. Second Method.—From A (Fig.22) to D, any point in BC, draw AD.Make DAE = ADC, and AE will beparallel to BC. (2T.1.) Fig. 22.
Surveying
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