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230                       METALLURGY   OF   CAST   IRON.
place the sticks on blotting paper resting on wire netting, supported in a pan four to six inches deep, containing about two inches of water, as shown by Fig. 49. This pan should have a cover, which can be closed air tight in case the phosphorus takes fire. This is a method which was presented by Mr. Max H. Wick-horst in a paper before the Western Foundrymen's Association, March 17, 1897. Phosphorus can be obtained from almost any druggist, and comes in the form of sticks about three-quarters of an inch in diameter and four inches long, weighing about two ounces, and is kept in corked bottles, etc., of water holding about half-a-dozen sticks of phosphorus. It has to be kept in water on account of its being a substance which will melt at about in degrees P., and ignite of its own accord if left exposed a few minutes to the drying influence of the air.
Another discovery of importance revealed by these tests is found in Table 34. This shows that an increase of phosphorus increases the fusibility of iron. This knowledge is valuable in showing that the lower the phosphorus the better, in castings such as annealing boxes and pots, ingot moulds, grate bars, etc., which are required to stand high temperatures. Up to the time the author presented his tests (see Table 34) there was no information -obtainable designating what percentage of the metalloids was best in fire-resisting castings. With the information to be gleaned from pages 352 and 351: it will be seen that the lower the combined carbon, sulphur, and phosphorus, the better the iron to resist melting or high temperatures. This knowledge is very valuable in assisting to make mixtures for castings that are expected to resist high or melting temperatures.
J*~"olten metalthe  above  bars, described in Tables 31   andthe so-The philosophical explanation of this extraordinary effect i my opinion, to be found in the fact that the f erro-manganesu .ğR. C. Hindiey, M. Hoskins, Harvard College, Havemeyer University, Henry Hiels Chemical Co., Isabella Furnace, Iron Gate Furnace, Iroquois Iron Co., Illinois Steel Co., Jefferson Iron Co., Kittan-ning Iron & Steel Co., C. A. Kelly Plow Co., Lebanon Furnace, Longdale Iron Co., Lackawanna Iron & Steel Co., Logan Iron........................   16,720     "                                     t-