. Chemical testing of milk and cream. Milk; Cream. 28 lighter than really is the case. Again, many substances can not be exposed to the air without absorbing atmos- pheric moisture and in this way introducing an error into the weighing. For these reasons it is customary always to cool the dishes in a device known as a desiccator (fig. 25) before weighing them. A desiccator is a specially con- structed covered jar containing a substance like calcium chlorid, which attracts to itself all the atmospheric mois- ture in the inclosed space surrounding it. The desiccator, containing no moisture, will
. Chemical testing of milk and cream. Milk; Cream. 28 lighter than really is the case. Again, many substances can not be exposed to the air without absorbing atmos- pheric moisture and in this way introducing an error into the weighing. For these reasons it is customary always to cool the dishes in a device known as a desiccator (fig. 25) before weighing them. A desiccator is a specially con- structed covered jar containing a substance like calcium chlorid, which attracts to itself all the atmospheric mois- ture in the inclosed space surrounding it. The desiccator, containing no moisture, will, of course, permit a substance. FiG.,24.—Analytical balance. to be kept in it without absorbing any. The calcium chlorid, which forms a layer about 1 inch deep on the bot- tom of the desiccator, should be renewed as soon as it shows any signs of moisture. The cover of the desiccator should be removed only as often as is necessary, and then for the shortest possible time. Milk dishes.—These are commonly made of aluminum and should be from 2 to 2\ inches wide and about one-half inch deep (fig. 26). Each dish should bear a number by which it can be identified; this number may be scratched or pimched on the 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 United States. Bureau of Animal Industry. [from old catalog]; Shaw, Roscoe Hart. [from old catalog]. Washington, Govt. Print. off.
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Keywords: ., bookcentury1900, bookdecade1910, bookpublisherwashingtongovtprin
