Elements of surveying and navigation : with a description of the instruments and the necessary tables (1847)
Davies, Charles, 1798-1876 · New York : A.S. Barnes & Co. · leaf 40
rate approxi-mation in practice, on account of the imperfection of the instruments required in constructing them. Trigonometrical methods, on the contrary, being inde-pendent of mechanical operations, give solutions with theutmost accuracy. 41. For the purposes of trigonometrical calculations, the… … As the circumference of a circle may be regarded as a pro-per measure of angles, having their vertices at the centre, thefour right angles which can be formed about the same point,are measured by 360 degrees ; two right angles by 180 degrees, one right angle by 90 degrees, and an angle lessthan a…
Surveying · Navigation
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