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 157
a, the mouth of the channel. He continues the same course, and knows when he is about halfway from a to b by the two objects, C and D, appearing in the sameline. When C and D become fairly open, and C nearly north,and B not quite north-east, he is then at the turning point b of thechannel. His… … LEVELING 155 C HA PTEE VIII. LEVELING. Two or more points are said to be on a level, when they areequally distant from the center of the earth, or when they are equallydistant from a tranquil fluid, situated immediately below them. Alevel surface on the earth, is nearly spherical, and is not a…
Surveying · Navigation
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