Journal of the Association of Engineering Societies (1881)
Association of Engineering Societies (U.S.) · New York, [etc.] Board of Managers · leaf 26
tops on line with the point B at the bottom of the excavation. Measure A O by preceding methods, also K M, and by leveling K S and M O. By the two similar triangles X N R and X B P, X P can be found, and as X O is known, O P or its equal A B is known, which is the vertical dis- tance required. (13)… … Fig 11. Fig. 12. angles to the one which precedes it, to K L. On K L find the point M, so that a perpendicular to K L will pass through D. Find B N and N D the same as in problem 2. Lay off O B X and DPR each similar to B N D. X B will give the direction at the portal B, and P D at the portal D.…
Engineering
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