_To find the area of a required pipe_, the volume and velocity of water being given, multiply the number of cubic feet of water by 144 and divide the product by the velocity in feet per minute. The area being found, the diameter can be learned by using any table giving the "area of circles" and finding the nearest area, opposite to which will be found the diameter to correspond. Physical and Chemical Constants of Fixed Oils and Fats. (FROM LEWKOWITSCH AND OTHER AUTHORITIES.) ______________________________________________________________________________ | |Specific | | | | Specific |gravity | Melting- |Solidifying- | | gravity | at | point. | point. | | at 15deg.C.|100deg.C. | deg. C. | deg. C. | _______________________|____________|__________|_____________|_______________| | | | | | Linseed oil | 0.931-0.938| 0.880 | -16 to -26 | -16 | Hemp-seed oil | 0.925-0.931| | | -27 | Walnut oil | 0.925-0.926| 0.871 | | -27 | Poppy-seed oil | 0.924-0.927| 0.873 | | -18 | Sunflower oil | 0.924-0.926| 0.919 | | -17 | Fir-seed oil | 0.925-0.928| | | -27 to -30 | Maize oil | 0.921-0.926| | | -10 to -15 | Cotton-seed oil | 0.922-0.930| 0.867 | | 12 | Sesame oil | 0.923-0.924| 0.871 | | -5 | Rape-seed oil | 0.914-0.917| 0.863 | | -2 to -10 | Black mustard oil | 0.916-0.920| | | -17.5 | Croton oil | 0.942-0.955| | | -16 | Castor oil | 0.960-0.966| 0.910 | | -12 to -18 | Apricot-kernel oil | 0.915-0.919| | | -14 | Almond oil | | 0.915-0.920| | | -10 to -20 | Peanut (arachis) oil | 0.916-0.920| 0.867 | | -3 to -7 | Olive oil | 0.914-0.917| 0.862 | | 2 | Menhaden oil | 0.927-0.933| | | -4 | Cod-liver oil | 0.922-0.927| 0.874 | | 0 to -10 | Seal oil | 0.924-0.929| 0.873 | | 3 | Whale oil | 0.920-0.930| 0.872 | | -2 | Dolphin oil | 0.917-0.918| | | 5 to -3 | Porpoise oil | 0.926 | 0.871 | | -16 | Neat's-foot oil | 0.914-0.916| 0.861 | | 0 to 1.5 |