Page:Popular Science Monthly Volume 92.djvu/762

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��Popular Science Monthly

��DIAPHRAGM

��A Simple and Effective Heat- Economizing Stove

AT a recent exhibition L of heating ap- pliances in Paris, a simple heating stove of sheet iron was shown, which, it is claimed, greatly econo- mizes heat and fuel. The stove is intended for burn- ing vegetables, fuels of low heat value, such as wood, peat, sawdust, bark, etc. In outward appearance the stove resembles the so- called "cannon stoves" which were so popular in this country about thirty years ago.

The characteristic feat- ure of the stove is a sheet- iron diaphragm, running diagonally from below the drafthole lead- ing to the flue, upward and toward the front of the stove. The gases pro- duced by the combus- tion, the smoke and the heat, instead of passing immediately to the drafthole and to the flue, are compelled to make their way up in front, then around the edge of the diaphragm, then down in the rear of the stove, to the draft- hole. On their way out they heat a greater sur- face of the metal of the stove, giving it greater heating power without increasing the amount of fuel used.

���The hot gases of combus- tion and the smoke can- not reach the flue with- out passing around the diaphragm of this stove

��Paint That Barn by Machine

MR. F. L. BENE- DICT, of Bal- timore, has perfected a device for spraying paint and distributing it over a surface by means of rotating brushes.

The device consists, in its main features, of

��two rotating brushes with a space be- tween them, sufficient for the paint to be sprayed on to the surface to be painted. A nozzle provides the means for spraying the paint. The brushes are rotated by a small turbine engine oper- ated by compressed air, which is also used to force the paint to the nozzle and to spray it. The engine is connected with the brushes by a chain of gears. The flow of paint and of the air for the sprayer is regulated by a valve operated by a trigger combined with the handle. The brushes are covered with an aluminum case and rotate towards each other, by which ar- rangement a spattering of the paint is avoided. The total weight of the device is about six pounds.

Trials with this device have given satisfactory results — ~ N^ considerable economy

in the cost of labor and in the amount of paint used and more satis- factory workmanship.

��The rotary painting machine spreads the paint evenly and well

��Details of the machine, showing the gears and controlling devices

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