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 112
AS be the line toward the sun,along the ground, AE a line due east, andMm a true meridian line. The angle SAEmust equal 9° 17. To make that angle, take^l/S, one chainor 100 links ; from S, draw the line SEat right angles to AS, by means of asurveyors cross.* From £take SE, of such a value as will… … 108 SURVEYING. As 100. : &#=Rad. : tan. 9° 17Whence SIS=100 ^ 9° ir)= 9o21M05 &Er=16.347 links. 1.213405 That is, from S measure off 16 and a little more than ^ of a link,and there is the point E. A line drawn from A to E, is a due eastand west line. If we put the surveyors cross on this…
Surveying · Navigation
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