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 20
PROBLEM 10. To find the middle, or mean proportional, between two given lines. Place AB and .BC in one right line,and, on AC, as a diameter, describe asemicircle (postulate 3), and from thepoint B, draw BD at right angles to A C(problem 3); BD is the mean propor-tional required. Proof, (scholium to… … 16 SURVE^l JNG, PROBLEM 11. To find the center of a given circle. Draw any two chords in the given circle,as AB and CD; and from the middle point,n, of AB, draw a perpendicular to AB;and from the middle point, m, draw a per-pendicular to CD; and where these twoperpendiculars intersect will be the…
Surveying · Navigation
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