Tester le lait et ses produits ; un manuel pour les étudiants, les exploitants d'usine et de fabrique du fromage, de l'alimentation des chimistes, et les producteurs laitiers . force fuguée, évitant ainsi de graves accidents. La Swinging pock-ets qui détiennent de bouteilles dans somemachines letest doiventêtre, de telle façon qu'il thebottles revolvingframe notstrike le centre du lorsque dans une position horizontale.^^ ; = Tests ont perdu par oftenbeen neckcatching theend du au centre, les bouteilles omettant ainsi de takean position verticale quand le tourbillon s'arrête. 71. La vapeur d'échappement de la turbine tuyau shouldnot testeurs ont trop de virages dans elle ou être muc

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Testing milk and its products; a manual for dairy students, creamery and cheese factory operators, food chemists, and dairy farmers . fugal force, thus avoiding serious accidents. The swinging pock-ets which hold thetest bottles in somemachines, shouldbe so made that thebottles will notstrike the center ofthe revolvingframe when in a^ horizontal position.;^= Tests have oftenbeen lost by theend of the neckcatching at the center, the bottles thus failing to takean upright position when the whirling stops. 71. The exhaust steam pipe of turbine testers shouldnot have too many turns in it or be much reduced in sizefrom that of the opening in the tester. A free escape ofthe exhaust steam is necessary to prevent the steam col-lecting in the test bottle chamber and overheating thetest bottle when whirled (41). The cover of the tester should have an opening pro-vided with a sliding damper or some arrangement bywhich it can be closed when desired. If whole milk orcream is being tested, this hole should be open so that adraft of air may enter the test bottle chamber duringwhirling, and force the steam out of the bottle chamber. Fig. 25. Type of Babcock turbine testers. The Babcock Test. 63 into the exhaust pipe. If skim milk is being tested, theopening in the cover should be closed. This shuts offthe draft of air, and the exhaust steam heats the testbottles during whirling to 200° P. in some cases. Thishigh temperature aids in separating the last traces of fatin skim milk and gives a most accurate test of samplescontaining less than one-tenth per cent. fafc. Some ofthe most recent makes of turbine testers are providedwith holes in the cover and dampers. A thermometeris also placed in the cover. 3.—Sulfuric Acid. 72. The sulfuric acid to be used in the Babcock testshould have a specific gravity of 1.82-1.83. The com-mercial oil of vitriol which can be bought for about2 cents a pound in carboy lots, is commonly used. Onepound of acid is sufficient for fifteen tests. The acids

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