The Crystelliptometer An Instrument for the Polariscopic Analysis of Very Slend
The Crystelliptometer An Instrument for the Polariscopic Analysis of Very Slend
Le Roy D Le Roy Dougherty Weld
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& R. S. I. , VI and rows +2, 1, etc. , the other way, through a certain amount a, so that now the coordinates of S are x a, y = -fa (a being neg- ative). These changes are shown in Fig. 9. 12 Introducing the above values of s, q, x, and y into (13), and resuming m = tan 0, we get [~\ r T r~ n 45+ -180 cos -360 +cos 45 -f -180 5 J La J L 8 _r [a "1 fa ~| 45 + - 180 sin -360, 1 Fa T ' (18) L = sin 45 + - 180 sin ^360, L 5 J Id J P = sin|45 H-^ 180 |cosfo60] -tan (9 cos|45H-- 180 1. L d J La J L S... J While the attention is, indeed, fixed on one particular spot 5, 5 Fig. 9, whose coordinates are a and -fa, yet in actual practice it is expedient to make measurements on a number of spots, usually twenty or more, and deduce the position of S from them. Refer- ring to Fig. 9, it is clear that the abscissa of any spot in the nth vertical column (numbered along the bottom of the figure) is d (19) which gives n By measuring the abscissas of several spots in different rows, thus varying x and n, we obta'n as many independent observa- tions upon a.
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