546 KANSAS CITY REVIEW OF SCIENCE. 



A still more simple apparatus can be made with the same results, if the open- 

 ing or flue will admit a higher box. The shutters can be cast together in one 

 piece at an angle of about 130°, to hang within the box on two pins or bolts, 

 thus forming a swinging shutter. A rack is attached to the front of the shutter 

 to regulate the movement. 



The advantages of this apparatus are; — the cooling of the boiler is entirely 

 avoided, the gases are consumed so that smoke is prevented, and there is a sav- 

 ing of from 15 to 20 per cent of heat and coal. 



In ordinary open fire grates the same object is attained — viz.: the prevention 

 of the cold air from coming into contact with the green coal, by removing the 

 fire-lump, and substituting for it a cast-iron box, which stands out on the back 

 and is open in front only, and which is filled with coal. Within this box is a 

 movable iion plate, which can be forced forward, carrying with it the coals from 

 which the gases have been extracted and consumed by the heat in front, or 

 moved backwards when the box wants refilling. Tb regulate the draught so that 

 the fire burns brightly in front, a plate is fixed under the grate, coming forward 

 at the bottom. Another plate, resting on pins, is placed on the top of the box ta 

 prevent the flame entering the register. 



By this simple apparatus a bright fire is maintained in front of the grate, half 

 of the heat usually escaping into the chimney is saved, there is little or no smoke, 

 and the smallest coal can be used, and is, indeed, preferable. 



In kitcheners, stoves, and vertical boilers, a similar box to foregoing can be 

 fixed, the movable plate being worked by a lever. 



This invention is also of great importance to railway companies, as it can 

 easily be applied to locomotives. A box is placed under the foot-plate, the whole 

 width of the fire grate, and the coals put in from the top. By this means the 

 gases are almost entirely drawn out of the coal and consumed, the result being 

 very little, if any, smoke. To supply the grate, the coal is pushed forward by a 

 movable plale and lever. 



Whether applied to furnaces, ordinary open fire-grates, stoves, kitcheners, 

 vertical boilers, or locomotives, the results of this invention, in each case, are a 

 great saving of heat and fuel, and the reduction of smoke to a minimum. — Van 

 JVosirand' s Engineering Magazifte. 



