. Cane sugar; a textbook on the agriculture of the sugar cane, the manufacture of cane sugar, and the analysis of sugar-house products. Il ? I I i I I I I hill .1 i I I it fl 11111111 I 111 111 rill 111 f+ Fig. Fig. 323 perature to control the scale of a polarimeter of this type ; but, if used tocontrol the scale of a polarimeter compensating by rotation of the analyser,the correction for temperature must be applied. A control observation tube by Schmidt and Haensch is shown in ; it consists of an outer tube, T, in which is moved by means of a rack-and-pinion gear the tube /, fitting c
. Cane sugar; a textbook on the agriculture of the sugar cane, the manufacture of cane sugar, and the analysis of sugar-house products. Il ? I I i I I I I hill .1 i I I it fl 11111111 I 111 111 rill 111 f+ Fig. Fig. 323 perature to control the scale of a polarimeter of this type ; but, if used tocontrol the scale of a polarimeter compensating by rotation of the analyser,the correction for temperature must be applied. A control observation tube by Schmidt and Haensch is shown in ; it consists of an outer tube, T, in which is moved by means of a rack-and-pinion gear the tube /, fitting closely into T, exit of liquid between Tand / being prevented by the washer e : the tube / is closed by a glass discat c. The solution to be used for testing is poured into the funnel a, whence. Fig. 324 it fills the tube T. The distance between d and e is regulated by the rack-and-pinion gear, the exact distance and also the length of the column ofliquid being read off a scale carr3nng a vernier ; the tube is convenientlyfilled with a solution of the normal weight of sugar in 100 cc. ; with a columnof liquid 20 cm. long a reading of 100 should be obtained, and other readingsshould be proportional to the length of the column of liquid. A very rapidcontrol over the scale can thus be obtained. Of course, the scale can also betested by polarizing different weights of pure sugar in a tube of constantlength, but this, compared with the adjustable control tube, is a laboriousoperation. THE POLARIMETER 489 REFERENCES IX CHAPTER XXIV. 1. Phi]. Trans. Roy. Soc, 1818, 125. 2. An. Chim. Phys., 1840, 74, 428. 3. Edinburgh New Philosophical Journal, 1829, 6, 83. 4. Edinburgh New Philosophical Journal, 1831, 14, 372 ; 1839, 27, 332. 5. , 1869, 68, 221. 6. Proc. Roy. Soc, Edin., 1891, 8
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectsugar, bookyear1921
