The Babcock Test. 



73 



tion lias proved superior to or taken the place of the 

 regular Babcock test to any extent. 1 



84. Bausch and Lomb centrifuge. Fig. 28 shows a 

 form of hand centrifuge which may be used to advantage 



by physicians or in pathol- 

 ogical laboratories for the de- 

 termination of fat in milk. 

 The centrifuge is especially 

 designed for examination of 

 urine, sputum, blood, etc., but 

 has been adapted to milk an- 

 ( alysis by the Leffmann & Beam 

 test, a special form of bottle 

 (Fig. 29) having been con- 

 structed for this purpose. The 

 machine gives sat- 

 isfactory results by 

 the Babcock test as 

 well, provided the 

 acid used is 1.83- 

 1.84, or if the bot- 

 tles containing the 

 ette G an 9 d teK acid-milk mix- 



FIG. 28. Physician's centrifuge physician's ture be placed in 

 that may be used for milk testing, centrifuge. 



water f Qr fiye 



"or ten minutes prior to the whirling. As the bottles are 

 calibrated for only 5 cc. of milk and the neck of the 

 bottles, with scale, is correspondingly fine, testing milk 

 with this machine requires some nicety of manipulation 

 not called for in case of testers constructed for the use of 

 farmers and dairymen. 



i The German dairy chemist Siegfeld in 1899 proposed a modification 

 of the Babcock test (Molkerei Ztg, Hildesheim, 1899, p. 51), using 2 cc. of 

 amyl alcohol with the sulfuric acid, and filling up with dilute sulfuric acid 

 (1:1, sp. gr. 1.5) in one filling, in place of water, after the whirling. A clear 

 separation of the fat is facilitated by both these changes, but when prop- 

 erly conducted there is no difficulty whatever in obtaining a clear fat col- 

 umn in the Babcock test as described in this book, and the modification 

 will not therefore be likely to be introduced in American factories. It has 

 become quite generally adopted in North German creameries where the 

 Babcock test is used. 



