A treatise on surveying, comprising the theory and the practice ; (1887)
Gillespie, W. M. (William Mitchell), 1816-1868, Staley, Cady, 1840- [from old catalog] ed · New York, D. Appleton and company · leaf 550
* Three numbers, m, n, p, arranged in decreasing order of size, form an harmonicproportion, when the difference of the first and the second is to the difference of thesecond and the third, as the first is to the third. Such are the numbers 6, 4, and 3 ;or 6, 3, and 2 ; or 15, 12, and 10 ; etc. So,…
Surveying
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