The Crystelliptometer An Instrument for the Polariscopic Analysis of Very Slend

Cover 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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