Elementary treatise on physics, experimental and applied : for the use of colleges and schools (1906)
Ganot, A. (Adolphe), 1804-1887, Atkinson, Edmund, 1831-1901, Reinold, A. W. (Arnold William), 1843-1921 · New York : Wood · leaf 558
d arc,60 on the arc being graduated as 120°. A great advantage of this instrument is that a slight agitation does notaffect the measurement of the angle ; it can accordingly be used on ship-board, is indispensable for use at sea, and in travelling where the use ofa stand is objectionable. 532.… … Fig. 494 533] Mances Heliograph 541
Physics
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