. Principles and practice of butter-making : a treatise on the chemical and physical properties of milk and its components, the handling of milk and cream, and the manufacture of butter therefrom . Butter; Milk. SEPARATION OF CREAM. 131 In 1875 Prandtl exhibited at Frankfort-on-the-Main a con- tinuous separator, which did not at the time attract much attention, due chiefly to the excessive amount of power needed to overcome the resistant force of the air. In 1876 a Danish engineer named Winstrup succeeded in improving the old bucket method. In 1877 Lefeldt and Lentch offered for sale four cont
. Principles and practice of butter-making : a treatise on the chemical and physical properties of milk and its components, the handling of milk and cream, and the manufacture of butter therefrom . Butter; Milk. SEPARATION OF CREAM. 131 In 1875 Prandtl exhibited at Frankfort-on-the-Main a con- tinuous separator, which did not at the time attract much attention, due chiefly to the excessive amount of power needed to overcome the resistant force of the air. In 1876 a Danish engineer named Winstrup succeeded in improving the old bucket method. In 1877 Lefeldt and Lentch offered for sale four continuous separators with different capacities (from 110 to 600 pounds of milk per hour). During that year also the first practical centrifugal creamery was established at Kiel, Germany. In 1877 Houston and Thompson of Philadelphia filed a patent for the continuous method of separation of cream. Fig. 70.—First centrifugal separator. (From Dairy Messenger.) from milk. The patent was allowed in 1891. In March, 1877, Lefeldt and Lentch invented a separator similar in construction to the hollow bowl—a more recent t3rpe. This machine did not revolve at so rapid a rate as our modern machines do, nor did it have arrangements for continuous inflow and discharge. It was intermittent in its work, and it was necessary to stop at intervals to remove the cream and skimmed milk. 1879 was the year which marked the greatest advancement toward the perfection of modern separators. The appearance of the Danish Weston, invented in Denmark, and the De Laval, in- vented in Sweden during that year, marked a great advance-. 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 McKay, George Lewis; Larsen, Christian, 1874-. New York : J. Wiley & Sons
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