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This is an ingenious card designed to facilitate the modification of milk, which consists of a celluloid envelope labeled for the quantities of fat, proteid, sugar and whey to make the milk mixture. The envelope has a number of little windows cut in it, corresponding to the various quantities which it is desired to determine. Two cards designed to show the amounts for a 20-, 32-, 40 and 48-ounce mixture, respectively, are placed inside the envelope. The apparatus is employed as follows. If the desired percentage of proteid be brought to the corresponding window, one sees through the other windows the number of ounces of cream, skimmed milk and whey to be used and the percentage of fat, proteid and sugar obtained, together with the number of calories produced by each constituent. In a similar way the desired percentage of fat can be brought to the window and the amounts
Milk Modification Card.. JAMA. 1912;LVIII(24):1876. doi:10.1001/jama.1912.04260060225026