L. MECHANICS AND ENGINEERING. 487 



containing water. A claim is made and practical experi- 

 ments seem to substantiate it that one cubic foot of this 

 solution, discharged upon any burning pile, is capable of 

 doing as much execution in extinguishing a fire as fifty cubic 

 feet of water from an ordinary fire-engine, and in one twen- 

 tieth part of the time. 



Another important point is the capability of the invention 

 to instantly depolarize vast quantities of sulphurous vapors, 

 carbonic acid gas, carbureted hydrogen, and sulphureted car- 

 bureted hydrogen. A delivery jet one quarter of an inch in 

 diameter is said to be capable of instantly extinguishing and 

 depolarizing carbureted hydrogen from a two-foot main, work- 

 ing at three-inch pressure from the gasometer. By this meth- 

 od the air in coal-pits, mines, caverns, etc., can, it is claimed, 

 be rendered pure and healthy. This apparatus also may be 

 used for softening water for brewing and dyeing, and for pre- 

 venting incrustations in steam-boilers. 18 A, March 29, 

 1871,31. 



THE CALORIGEN A NEW HEATING APPARATUS. 



In a heating apparatus lately exhibited at the International 

 Exhibition in London, and called the Calorigen by Mr. George, 

 its inventor, the London Mechanics' Magazine finds what it 

 considers to be a new principle in heating and ventilation, of 

 very great merit. This arrangement claims not only to econ- 

 omize the combustion of gas or fuel in the utmost possible 

 degree, but also to combine with this a thorough system of 

 ventilation, by which all noxious products arc removed as 

 fast as formed, and the air left perfectly pure. It has been 

 adapted by the inventor especially as a gas stove, although 

 it is also used with coal and wood. The gas stove arrange- 

 ment consists of a cylinder of rolled iron, closed at the top 

 and bottom, so that the interior of the burner is entirely shut 

 off from the atmosphere of the room. This cylinder is fur- 

 nished with two pipes : one placed near the top to carry off 

 the products of combustion, the other near the bottom to 

 supply the air necessary for the combustion going on within 

 it. These two pipes pass through the wall into a second 

 vertical cylinder, parallel to the large cylinder inside. This 

 chamber is open only at the top, causing the air entering the 

 stove to come in contact with the heated air leaving it, acting 



