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 161
ced at T, midway between A and B; theinstrument will show them to be on the same level, as so they reallyare, for they are at equal distances from the center of the earth ; butif the observations were taken in reference to A and a. the apparentlevel would not show equal distances from the center of… … The figure before us represents this useful instrument, apart fromits tripod. Its principal parts are the telescope AB, to which is attached theleveling tube CD; the telescope rests in a bed, which is supportedby posts yy, called the ys; EE is a firm bar, supporting the ys.In S is a socket, which…
Surveying · Navigation
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