Beans, E. W. [from old catalog] · Philadelphia, J. W. Moore · leaf 72
ontal distance A Bthrough a precipice or clift too steep to be mea-sured with the chain. Plant a staff at C on the top ofthe cliff, aligning it with A and B,both of which may be seen from C.Run the line A E and measure it.Also measure the angles C A E =D A E; and C E A = D E A (thepoint D being… … 68 A MANUAL FOR SURVEYORS. zontal distances A D and B D. In this solution theplanes A D C, E D C, B D C and F D C are con-ceived to be at right angles to the plane A E D F B.By taking the altitude to the top of the staff C fromtwo stations on each side of the steep, the horizon-tal distance may be…
Surveying
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