. Testing milk and its products; a manual for dairy students, creamery and cheese factory operators, food chemists, and dairy farmers. 48 Testing Milk and Its Products. a diameter of at least one-eighth of an inch, as is gener- ally the ease. We have used or inspected some half a dozen other devices placed on the market by various deal- ers for delivering the acid, but cannot recommend them for use in factories or outside of chemical laboratories. 52. Instead of measuring out the acid, Baxtlett' has suggested add- ing 20 cc. directly to the milk in the test bottles, till the mixture rises to a
. Testing milk and its products; a manual for dairy students, creamery and cheese factory operators, food chemists, and dairy farmers. 48 Testing Milk and Its Products. a diameter of at least one-eighth of an inch, as is gener- ally the ease. We have used or inspected some half a dozen other devices placed on the market by various deal- ers for delivering the acid, but cannot recommend them for use in factories or outside of chemical laboratories. 52. Instead of measuring out the acid, Baxtlett' has suggested add- ing 20 cc. directly to the milk in the test bottles, till the mixture rises to a mark on the body of the bottle at the point where this will hold ec, i. e., the total volume of milk and acid (83). This method of adding the acid is in the line of simplicity, but has not become gen- erally adopted. If the method is used, the marks should be put on by the manufacturers, as the oper- ator in attempting to do so will be apt to weaken or break the bottles. Calibeation op Glassware. 53. Test bottles. The Babcock milk test bottles are so constructed that the scale of graduation on the neck measures a volume of 2 cubic centimeters, between the zero and the 10 per cent, marks (44). The standards for test bottles and other Babcock glassware adopted by the Association of Official Agricultural Chemists of America are given at the close of this book (306). It will be seen that the limit of error for test bottles is one of the smallest graduations on the scale, or .2 per. Fig. 18. Swedish acid-bottle; the side tube is made to hold cc. of acid. 1 Maine experiment station, bull. 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 Farrington, Edward Holyoke, 1860-; Woll, Fritz Wilhelm, 1865-1922. Madison, Wis. , Mendota Book Company
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