A treatise on surveying and navigation: uniting the theoretical, the practical, and the educational features of these subjects (1852)
Robinson, Horatio N[elson], 1806-1867. [from old catalog] · Cincinnati, J. Ernst · leaf 150
ms, mQ PQ as follows : As our radius is unity, we diminish the indices of the logarithmicsines by 10. log. a, 2.881556 log. a, 2.881556 log. m, 1.641771 log. R—1.008880 log. §,—1.469437 1.790436 1.111208 1.11 i 58.932 1.770348 log. P,—1.591878log. §,—1.469437 ■1.061315 ■1.061315 674.72 2.829121… … DIVISION OF LANDS. 145 Lemma. Find the point in any trapezoid, through which anystraight line which meets the parallel sides will divide the trapezoid intotwo equal parts. Let AB CD be the trapezoid. Bisect the parallel sides AB and CD inthe points n and m. Join mn, and bisectmn in 0, and 0 is the…
Surveying · Navigation
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