Elements of plane and solid free-hand geometrical drawing, with lettering; and some elements of geometrical ornamental design, including the principals of harmonic angular ratios, etc. In three parts ... for draughtsmen and artisans; and teachers and students of industrial and mechanical drawing (1878)
Warren, S. Edward (Samuel Edward), 1831-1909 · New York, J. Wiley & sons · leaf 119
string. By showing that the long and well established laws of musi-cal harmony, or beauty of sound, are based upon the numbers2, 3, 5, and their multiples, it will be more readily apparenttliat the abstract principles of beauty already described in con-nection with these numbers, are also as truly… … B^ c P e r G A B c, D, E, F, q, Aj 28. A note occasioned by a certain number of vibrations persecond (fixed upon by agreement), whether of a stretchedstring, as in a viol, harp, or piano, or of a column of air, as inan organ pipe, is adopted as a standard of comparison, anddesignated by the letter…
Geometrical drawing · Mechanical drawing
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