Elements of natural philosophy (Volume 2-3) (1850)
Bartlett, W. H. C. (William Holms Chambers), 1804-1893 · New York : Barnes · leaf 283
r 6 de-grees. Denote by n, the number of coincidences of any par-Notation.ticular color between A and B; there will be n + 1 18 274 NATURAL PHILOSOPHY. Graphic fringes from A to B in estimat- representation ; jng from J^ fQr one 0f the fringes j\ belonging to A will cover or fallupon the candle B.… … Same in form ofan equation; - n + 1 n PA tan —— . D = 2 PE As long as P E A does not exceed two or three degrees,its tangent may be taken equal to its arc, and we maywrite Equation forsmall angle ; n + 1 n PA~2~-^ = P~E whence, denoting A B by 5, and P E hy d. Notation; JD = (n + l).d substitution;…
Mechanics · Acoustics · Optics
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