746 



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 



