. Dairy farming : being the theory, practice, and methods of dairying. Dairy farms; Dairy plants; Milk plants. STRAINING AND COOLING. 447 More than half the American patents for milkers have been npon machines which have aimed to imitate the natural motion of the calf in suckino^. Ten of these patents were issued to L. O. Colvin, beginning in IStiO, and it is upon the general plan of his inventions that the greatest hope now lies for perfecting a practically satis- factory cow-milker. The latest machine of this kind, which has attained the highest mechanical merit and the most complete theoret

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. Dairy farming : being the theory, practice, and methods of dairying. Dairy farms; Dairy plants; Milk plants. STRAINING AND COOLING. 447 More than half the American patents for milkers have been npon machines which have aimed to imitate the natural motion of the calf in suckino^. Ten of these patents were issued to L. O. Colvin, beginning in IStiO, and it is upon the general plan of his inventions that the greatest hope now lies for perfecting a practically satis- factory cow-milker. The latest machine of this kind, which has attained the highest mechanical merit and the most complete theoretical action, is that of Albert A. Durand, made at Auburn, New York. StEAIXIXG, COOI.ING, AND AeEATING MiLK. Straining milk before " setting " it for cream or canning it for shipment is very essential, and too often neglected, coarse cloth make-shifts or other utensils being relied upon that do not answer the purpose. In most metal strainers the surface has been flat or concave, so it has not been possible to use wire cloth fine enough to remove all im- purities without filling the meshes and clogging the strainer. To do the work (piickl}^, the cloth or wire used is often so coarse as to make the opera- tion of little effect. The best American article of this kind is More's pyramidal strainer, illustrated in Figs. 2-5] and -I'-iZ. Its special advantage is the form of the strainer: the milk falls upon the sloping sides of the pyramid, and the sediment is the constantly carried to the base, leaving a clean surface through which the milk rapidly passes. This permits wire cloth of 100 mesh (10,000 per- forations to the square inch), which is finer than any cloth strainer used, and cleans the milk per- fectly. As it never clogs, it works very fast. The bowl is seam- less, of Britannia or copper, of fine form and finish, and of great strength. The strainer is at- tached by a coarse screw, and can be easily removed and cleaned. Strainers of dif- ferent meshes are furnished fo

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