Page:Popular Science Monthly Volume 92.djvu/618

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��Popular Science Monthly

��A Self-Contained Hot Water Foot Warmer

JT has been shown that a certain com- bination of salts brings about che generation of heat. By applying this

��the ceiling to the opposite corner of the room. This will take the cold air from the floor and force it out at the ceiling level. Naturally the air currents are forced from a lower to a higher level, thus equalizing the temperature. — John T. Ford.

���Pouring the salts into water to make a mixture that produces and holds heat

chemical phenomenon, a cheap and effi- cient warming bottle may be formed. First of all mix together sodium acetate and sodium hyposulphate in water, using one part of the former to nine parts of the lat- ter salt. There should be a sufficient quan- tity of these materials to fill the earthen- ware bottle three parts full. The vessel should now be loosely stoppered and placed either in hot water or in an oven until the salts have completely dissolved. For many hours after this the bottle will radiate considerable heat. To renew the warmth-giving properties, it is only necessary to give the bottle a good shaking. — S. Leonard Bastin.

��Circulating Air in a Room to Warm It Evenly

THE temperature of a heated room is several degrees warmer at the ceiling than at the floor. To equalize the tem= perature, it is necessary for the air to be in circulation. This may be accom- plished with an electric fan, but to pre- vent any unnecessary draughts, the blast from a fan should be confined. As the air must be driven from the floor to the ceiling, place the fan in one corner of the room in such a position that it will drive the air upwards. To keep the air con- fined, make a cardboard tube about fi in. in diameter to carry the air up and across

��Inward Flaring Cover for an Oil and Plumbago Can

THE photograph and drawings illus- trate a very handy "dope" can which is convenient in many ways to the mechanic. The mixture, more com- monly known as "dope," being a com- bination of plum- bago and oils, is used on thread joints to prevent them from rust- ing and being difficult to re- move.

Due to the con- struction of the cap or cover, the can, if overturned or upset, will ahvays retain a goodly portion of its contents. Around the opening or mouth a piece of wire is bent and soldered in the form of a loop. This affords a good swipe for the brush, cleaning ofT any surplus which may adhere to the bristles. It keeps the'mouth of the can clean as the oil surplus drops at once into the middle of the opening. The square shouldered

���You can't spill every- thing from this can

���Details of the parts for making the can with its flaring cover to hold the lubricant

portion on one side will be found very convenient for catching and holding the can on any projection which may be near the work requiring the application of the dope.— F. W. Bentley, Jr.

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