N. K. Howard, Lincoln, Neb., writes: "I wish to heat a swimming pool 125x38 feet in size and 6 feet deep. I want to use live steam at high pressure, run through a deadener. How large a pipe will I need, what kind of a deadener should I have to insure freedom from noise, and about how long will it require to heat the water in the pool ? "

[In The Engineering RECORD of November 22, 1892, an illustration is given of a " deadener " which appears to be well adapted to this case. We suggest that you make it about 4 feet long, the internal perforated brass pipe to be 2 inches in diameter and the 4-inch space about it to be filled with broken pebbles or some such substance. Locknuts should be used at top and bottom of the deadener so that it may be taken apart for cleansing. This should rest on the bottom of the tank, and have a galvanized-wire guard about it large enough to prevent bathers from touching it. With high pressure steam a 1½-inch pipe will be amply large. The valve should be out of the reach of the bathers, so that the pipe on the tank side of the valve will be cooled when the steam is shut off. Steam should be turned off when the temperature of the water reaches 7c0 Fahr.,as the 4,750 square feet of water surface in the tank will absorb heat from the greater heat of the air in the tank-room. The time required to heat the water will depend upon the temperature of the air in the room and of the water to be heated. The overflow pipe should be at the opposite end of the tank from the heater, as the top current when heating will naturally be towards it. If a small stream of water is allowed to flow continuously into the tank, the floating animal fats, etc. on the top of the water will pass off through the overflow, which will thus act as an effective skimmer. A coil of 1-inch brass pipe, four high, across one end of your plunge bath, the bottom pipe being capped and ⅛-inch holes drilled a few inches apart, on its bottom side, will also make a very good heater, and, like the other, should be faced with a wire guard.]