A treatise on surveying and navigation: uniting the theoretical, practical, and educational features of these subjects (1857)
Robinson, Horatio N[elson], 1806-1867. [from old catalog] · Cincinnati, J. Ernst; Toledo, Anderson, Burr, & co. · leaf 168
l,it may be necessary to move the instrument several times. Theplane thus established, is represented by the curve am. In the same manner, by placing the instrument at b, we canestablish the next plane bn. Then the next, and the next, as many as we please. Where thehill is more steep, two of these… … 166 SURVEYING. ELEVATIONS DETERMINED BY ATMOSPHERIC PRES-SURE, AS INDICATED BY T H E B AR O M E T E R . The higher we ascend above the level of the sea, the less is theatmospheric pressure (other circumstances being the same), andtherefore we can determine the ascent, provided we can…
Surveying · Navigation
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