HEATING BY INCANDESCENT MANTLE.

Clutha Leader, Volume XXXIII, Issue 2040, 21 August 1906, Page 1

HEATING BY INCANDESCENT MANTLE.

The invention of the Welsbaeh mantle marked a distinct advance 1 in methods of gas lighting. It is now common, and its advantages and disadvantages are familir to most users. Wo are now to'd that the incandescent mantle may be applied also to heating-apparatus. Writes .). Laffaiguo in an article on "Kadio-incandescent Urates" in La Nature: "The incandescent mantle hae hitherto been used only for lighting purposes. Mr Delago, a chemical engineer, has devised, a new mantle, made, of radio-incandescent substances, having pronounced calorific qualities, which can not fail to Ik; useful in domestic heating, It is an application of tho most recent discoveries regarding tho properties- of rare earths and radiant bodies. The heatingmantle in> question u composed of a n«w mixture of rare earths in which the dominant active substance is cerium, which Ims a very high radiating power. It may be estimated, that such a mantle radiates 100 per cent, more heat than a Welsbach mantle of the, same form and the same weight, on a burner. A WeLsbach mantle transforms the olxicure heat of a blue-flame burner into luminous radiations whoso spectrum is specially rich in yellow ;:nd green rays with wine Line and little red. The heating mantle gives a spectrum made of of Ted and intra-red Tays, encroaching much on the invisible part, but rich in heat-rays. The output of the apparatus may be considered as 40 per cent, greater than that of the devices hitherto known. "This apparatus gives out no more poisonous pr<iducts than the Welsbacli devices used for illumination; the burners are precisely the same. A heating-appara-tus is composed of a numlier of intensite gas-burners disposed in a row. Above each of the burners is placed a. mantle called the radio-incandescent body. Tho mantles aie heated by the flame of the burners ; they ara almost, non-luminous, but emit a very intense heat horizontally. Tho burners are grouped in the device, but each is independent and has ite own stopcock. Thus a satisfactory degree, of control is assured. There is never observed, a setting hack of the flame, nor explosion; nor whistling, nor flame that deposits soot owing to scarcity of air-supply, nor lack of symmetry and consequent poor control of the, flames. It is possible to put out one to four burners out of live, if it is desired to lessen the heat supply, and this arrangement is much preferable to that in which the flames are turned up or down together. The way in which the man'ies are mounted on the burners makes it easy to handle them. . . . The whole col'i'ction forms a rigid body which may be lifted up and carried about at will. (In the foregoing principles .numerous types of grate have been devised, among which we shall only mention two. The arrangement of the incandescent mantles may easily bf seen. All nwessary precautious have been taken to carry off the products of combustion. The radio-incandescent giato is a simple and convenient system of heating and will doubtless meet with appreciation.