K. DOMESTIC AND HOUSEHOLD ECONOMY. 415 



a cork. When light is desired the cork is simply removed for 

 an instant to admit the air, and a clear light is emitted from 

 the empty space in the flask. The intensity of the light when 

 it diminishes may be renewed by admitting air again. A 

 lantern thus prepared, it is said, may be used continuously for 

 about six months without the least trouble. 15 C,XXIII.,368. 



THE CHANDOR LIGHT. 



At a recent gathering in Edinburgh, Professor Archer drew 

 attention to a new invention the Chandor light. The ap- 

 paratus is, in outward appearance, a small tube three or four 

 inches long, having at one end a revolving button, which 

 turns a screw, and at the other a minute angular point of 

 metal, which also revolves, passing over a little orifice in the 

 closed head of the tube. A continuous tube, formed of a 

 delicate strip of solidified collodion, with a ridge of hardened 

 phosphorus on one of its sides, is slipped into the tube, and, 

 once in position, can be moved upward by the screw. By 

 the same action which presses the upper end of the fuse 

 against the opening of the top, the metal point is turned 

 against the phosphorus, and a small portion of the collodion 

 is thereupon ignited. When the apparatus is afiixed to a gas- 

 burner, only a very transient flash is needed for the purpose 

 of ionition, and not more than a seventieth part of the collo- 

 dion fuse is consumed in the operation. When, however, the 

 wick of a lamp has to be lighted by the same means, a larger 

 proportion of the fuse, the thirty-second part in fact, is burned. 

 The apparatus is either portable or adapted to the uses in- 

 dicated. If a lamp goes out, it can be instantly relighted 

 by a turn of the screw, instead of by opening the case, remov- 

 ing the chimney, and striking a lucifer match, thus aftbrding 

 a great advantage in cases where quantities of combustible 

 material are lying about. The Builder^ Feb. 13, 1875, 149. 



LAMP FOR BURNING NITRIC OXIDE GAS. 



The brilliancy of the light produced by the combustion of 

 nitric oxide gas, after mixture with a few drops of sulphide 

 of carbon, has been known for some time, and its application 

 to photographic purposes suggested ; but it is not until re- 

 cently that Messrs. Delachanal & Mermet have constructed 

 an apparatus by which it can be made practically available. 



