. La chimie des produits laitiers ; un manuel pratique pour les chimistes et d'autres d'avoir le contrôle de laiteries. Les produits laitiers. 90 FORMULES POUR LES CALCULS. Sdk. Fig. 9. Échelle de lait. fin de l'échelle de gravité spécifique donne ensuite le gras tel que calculé par la formule T  = 0-25 G  + 1-2F  + 014. Pour faciliter la lecture, Cassal et Gerrans propose d'ajouter deux pointeurs, l'un sur l'ensemble des solides l'échelle, et une sur la diapositive la gravité spécifique, qui sont d'abord placés contre la partie de la balance correspondant à de solides et gravité spécifique trouvés respectivement, et les deux pointeurs sont ensuite ajustés. C'arrang

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. Dairy chemistry; a practical handbook for dairy chemists and others having control of dairies. Dairy products. 90 FORMULAE FOR CALCULATIONS. Sdk. Fig. 9. Milk Scale. end of the specific gravity scale then gives the fat as calculated by the formula T = 0-25 G + 1-2F + 014. To facilitate reading, Cassal and Gerrans propose adding two sliding pointers, one on the total solids scale, and one on the specific gravity slide, which are first placed against the part of the scales corresponding to total solids and specific gravity found respectively, and the two pointers are then adjusted. This arrangement prevents the possibility of error in adjusting the slide. The author has also employed a runner made out of a piece of brass bent round the milk scale, in which two holes are cut, leaving a narrow bar between them ; this bar partially covers both the total solid and specific gravity scales, and has a fine line drawn upon it at right angles to the scales. By adjusting this line to the total solids, and the specific gravity to the line, the object sought by Cassal and Gerrans is attained. Stokes uses a strip of transparent celluloid on which a fine line is drawn. The idea of the runner is due to Lieutenant Mannheim of the French Artillery, who, in 1851, devised it for a logarithmic slide rule. The scales are divided into tenths, hundredths being estimated by the eye ; a decimal scale, or, better, a vernier, as suggested by Sykes, can be applied to the runner, rendering it easier to read the second place of decimals. This, however, is not necessary, the error due to unavoidable circumstances being greater than the error of computation of the hundredths. Tables for Calculation.—Table XVIII. is for the calculation of solids not fat to 2 places of decimals by the author's formula. The G values of 0-2625 ~ can be found by means of the first part of the table, including the difference table, for each 0-lc from 22-0C to 37-5°, and in the second part of the table the values of 0