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 19
parts.Let AB represent the given line, andlet it be required to divide it into anynumber of equal parts, say five. Fromone end of the line A, draw AD, inde-finite in both length and position. Takeany convenient distance in the dividers,as Aa, and set it off on the line AD;thus making the parts Aa,… … INTRODUCTION. 15 PROBLEM 8. To find a third proportional to two given lines. Let AB and AC be any two lines. Placethem at any angle, and join CB. On thegreater line, AB, take AD=AC, and throughD, draw DE parallel to BC; AE is the thirdproportional required. Proof, (th. 17, b. 2).
Surveying · Navigation
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