2OO THE MACHINE-SHOP machines are provided with special supplies of cooling fluid particularly suited to the kind of work done in them. The floods of lubricant supplied are mostly recovered. For the collection of liquids at the machines, tanks or trays are now fitted. In these the lubri- cant is drained through a grating, leaving the chips and dirt behind. At DETAIL OF OIL F/LTEft ARRANGEMENT B i ! £ I H !| * 1 ! IL. A H r . i. ii r t—t t_ Ml* •*"•*• »*' ---------------- ***-# JT- -7 '•-"•;,' Details of Filter for Lubricating Oil MCLEAN OfL TO MACHINES _^a jZvl DRAIN FROM MACHINES SUPPLY LINE CHI DRAIN LINE DRAIN LINE Fig. 34.—Enlarged Details of Oil Piping System intervals the liquid is drawn off to be treated in centrifugal machines, or in filters. Fig. 33 is an illustration of the arrangement of oil piping and a filtering system in the American Tool Works, as laid down by the Richardson- Phenix Company, of Milwaukee, Wis., U.S.A. The full lines show the supply pipes for clean oil; the dotted lines, the return drain pipes. The first, starting from the centrifugal pumps, A, diminish from zj-in. bore to f-in. bore at their terminations. The drain pipes increase from i-in. to 3-in. bore where they terminate at the filter B, which is shown in detail in fig. 34.