Saccharose specific rotation

Two principal methods of graduation are in use in saccharimeters. In the Soleil scale, the rotation of the plane of polarisation given by a quartz plate i mm. thick is taken as ioo. In the Ventzke scale, which is the more commonly employed, the rotation due to a pure saccharose solution of specific gravity i-i at 17-5° C. and 20 cm. in length is taken as 100. 

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