. Dairy chemistry: a practical handbook for dairy chemists and others having control of dairies. LACTOMETERS. 165 The best lactometers for use in milk testing are the therino- lactometer, Soxhlet's, i and Vieth's. i"*^'"'] The thermo-lactometer cannot be made very small nor very delicate on account of the en- closed thermometer, and re- quires a comparatively large bulk of milk ; it is thus more suitable for testing in the dairy than in the laboratory, where samples are often limited. It has, however, the advantage of not requiring a separate ther- mometer and a separate opera- tion
. Dairy chemistry: a practical handbook for dairy chemists and others having control of dairies. LACTOMETERS. 165 The best lactometers for use in milk testing are the therino- lactometer, Soxhlet's, i and Vieth's. i"*^'"'] The thermo-lactometer cannot be made very small nor very delicate on account of the en- closed thermometer, and re- quires a comparatively large bulk of milk ; it is thus more suitable for testing in the dairy than in the laboratory, where samples are often limited. It has, however, the advantage of not requiring a separate ther- mometer and a separate opera- tion to determine the tem- perature. Vieth's lactometer can be used in a can and, if the samples are received in cans, as is often the case in a dairy laboratory, no transference of the sample is necessary. Soxhlet's lactometer has a wider scale, and may be con- veniently used when greater accuracy is required. Galaine's self-correcting lacto- meter has a metal ball completely filled with chloroform attached to the bottom, the object being to obviate the necessity of cor- rection of the specific gravity for temperature; the expansion of the chloroform was supposed to compensate the expansion of the milk. Though excellent in theory, it has proved disappoint- ing in practice. The following directions are due to Vieth :— Use of Lactometer. — In order to determine the specific gravity, the milk is poured into a vessel at least ^ in. greater in diameter than the widest part of the lactometer, and deep if. Fig. 4. Fig. 5. Thermo- Soxhlet's lactometer. Lactometer. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Richmond, Henry Droop. London : C. Griffin & Company, limited
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