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 153
the ruler passed over 0, in turning from one object to the other,subtract the larger angle from 180°, and to the remainder add thesmaller angle, for the angle sought. 2. To determine lines in extent and position. Let CD be a base line; havingthe paper on the table, all dried andready for use. Place… … THE PLANE TABLE. 149 Now level the instrument, and clamp it fast; it is then ready foruse. Sight to the other end of the base line, and mark it along the fineedge of the ruler. In the same manner sight along the direction of CE, and markthat direction in a fine lead line, that can be easily rubbed…
Surveying · Navigation
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