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 205
center on a certain occa-sion was 42° 17; and its horizontal parallax at the same time was58 12; what was the parallax in altitude, and what was the moonstrue altitude? Ans. Parallax in alt. 43 4 True alt. 43° 0 4 202 CELESTIAL OBSERVATIONS. No other examples of this kind are necessary, as they… … The quadrant and sextant are essentially the same instrument,and the following is an explanation of the principle on which theyare constructed. Let AB 0 be a section of a reflecting sur-face, FB a ray of light falling upon it, andreflected again in the direction BE, and BDa perpendicular at the…
Surveying · Navigation
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