Milk and its products; a treatise upon the nature and qualities of dairy milk and the manufacture of butter and cheese . This method of testing milkwas devised by Messrs. Leffman and Beam, and issometimes known under their name, though the ap-paratus was patented by H. F. Beimling, and intro-duced under his name. The Beimling test was in-troduced in the j^ear 1890, and was essentially likethe Babcock test, the exception being that insteadof a single reagent two were used, one ordinarycommercial sulphuric acid, as in the Babcock test,and the other a mixture of amyl alcohol and com-mercial hydro
Milk and its products; a treatise upon the nature and qualities of dairy milk and the manufacture of butter and cheese . This method of testing milkwas devised by Messrs. Leffman and Beam, and issometimes known under their name, though the ap-paratus was patented by H. F. Beimling, and intro-duced under his name. The Beimling test was in-troduced in the j^ear 1890, and was essentially likethe Babcock test, the exception being that insteadof a single reagent two were used, one ordinarycommercial sulphuric acid, as in the Babcock test,and the other a mixture of amyl alcohol and com-mercial hydrochloric acid. Largely because of thegreater inconvenience of using two reagents, theBeimling test has fallen into disuse. Tests introduced since the Bahcock test.—Two orthree tests differing but slightly from the Babcockhave been introduced since. One of these is knownas Gerbers method, the invention of a Germanchemist. The form of the testing bottles differs Bahcock Test 93 somewhat from that used by Dr. Babcock ; lesswhirling is required, and the same reagents areused as in the case of the Beimling. The DeLaval. Fig. 12. Hand centrifugal for Babeook test. Separator Companj^ has also introduced an appara-tus for testing milk which is known as the butyrom-eter. In this test a single reagent, sulphuric acid,is used to set free the fat. The form of the ap- 94 Milk and Its Products paratus is different from the Babcock test, a muchhigher speed of whirling is used, a smaller sampleof milk is taken, and the fat is read in a solidinstead of a liquid form. DETAILS OF THE BABCOCK TEST The apparatus used in testing milk by the Bab-cock method consists of a centrifugal machine, threepieces of glassware and commercial sulphuric acid. The centrifugal machine.—Many forms of centri-fugal machines are in use, almost every manufacturerhaving his own particular style. It is essential thatthe centrifugal should be substantially made ; that itshould run smoothly and steadily, either loaded or
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