Knight's American mechanical dictionary : a description of tools, instruments, machines, processes and engineering, history of inventions, general technological vocabulary ; and digest of mechanical appliances in science and the arts . ated with oil to make itwater and jierspiration jn-oof. Oil-still. A still for hydrocarbons, notably petro-leum. .See Petkoleum-still. Oil-stone. A slab ol fine-grained stone, set in awooden block and provided with a wooden cover,used lor imparting a keen edge to tools : it is socalled because oil is used for lubricating its rubbingsurface. See Whetstone. See li
Knight's American mechanical dictionary : a description of tools, instruments, machines, processes and engineering, history of inventions, general technological vocabulary ; and digest of mechanical appliances in science and the arts . ated with oil to make itwater and jierspiration jn-oof. Oil-still. A still for hydrocarbons, notably petro-leum. .See Petkoleum-still. Oil-stone. A slab ol fine-grained stone, set in awooden block and provided with a wooden cover,used lor imparting a keen edge to tools : it is socalled because oil is used for lubricating its rubbingsurface. See Whetstone. See list under Giund-INT, AND Polishing. Oil-tank. A large vessel for holding oil for — 1. Treatment. 2. Storage. Fig. 3386. 3. Transportation. 1. Tanks lor treat-ment are usually largereservoirs or maybe given. In Fig. 3386, theoil or fat is placed inthe inner tank, whichhas a vertical shafthaving radial stirrersand a discharge-pipeat its lower conicalend. It is surround-ed by a water orsteam chamber, bywliich the oil or fatis heated to 90° or100° Fah., respective-ly, and yeast, 3 parts,added to 40 parts ofthe grease. The wholeis stirred while warm,and then left to fer-ment, when sedimentis drawn off at the. Oil-Purifi/ing Tank. bottom. The tank may be used in the See also Lard-t.\xk. Fig. 3387 shows an arrangement of tanks for carry-ing out successively the operations of oxidizing, neu-tralizing, steaming and heating for evaporation, oilsto be purified ; and ol special devices to be employedin connection with one or more of the tanks for theaddition of oxidizing and neutralizing chemicals tothe oils, for stirring and agitating the same, and for OIL-TANK. 1557 OIL-TAXK. indicating tlie condition of the contents ofthe several tanks. The o.\idizing-tank A is piovided with adetachable stirring-shalt H, and diiiusing-sieve P. On the next step is a neutraliziiig-tank £ with sieve P at top, and steam orhot-air pipes Q within tlie same. Th
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