Bulletin - State College of Washington, Agricultural Experiment Station Volume 1-36 (Paperback)

This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1892 edition. Excerpt: ... milk presses against the bottom of the bottle much harder than before; in other words, its weight is several times multiplied by the motion. The difference between the weight of the fat and of the heavy liquid in which it floats is increased in the same ratio, and the fat rises to the top, or rather toward the center of the machine. Five minutes rapid turning suffices to bring practically all the fat to the surface, where it may be'seen as a thin transparent layer. It is melted, as the liquid on which it floats is hot. Hot water is now to be added to bring the fat into the bottle neck, where it can be measured. The Fig. 3--Babcock Milk Tester. water should be as nearly boiling as practicable, for it soon cools in the narrow neck of the bottle, allowing the fat to solidify. If the fat does turn solid it should be melted by pouring hot water on the outside of the neck. Hot Water.--The hot water may be conveniently added by pouring it first into the acid measure, taking care that no acid is in the latter. (Hot water and sulphuric acid mixed suddenly will explode). Pour from the acid measure to the test bottle. The water should rise into the neck of the test bottle nearly to the top of the graduated scale. The bottles need not be removed from the machine for this purpose. When one has a considerable number of tests to make it is desirable to have a more convenient method of handling the hot water. Two very convenient methods are shown in fig. 2. One consists of a half gallon bucket covered by a lid to keep the water hot. Near the bottom on one side is soldered a small tube on which a rubber tube about two feet long is placed. This tube should cost about 25 cents, and the tube soldered in the side of the bucket need not cost more than 10 or...