DESCRIPTION OF A LAMJP. 109 



ger of (pilling the oil by inclining it, which is an inconvenience 

 of great magnitude, and hitherto conftituting one of the great- 

 eft objections to the lamps in ufe. 



In other lamps the flame varies in its intenfity commonly in 

 about two hours ; but in the mechanical lamp it conftantly 

 preferves the fame fupply and the fame brilliancy. ' 



The median ifm adapted to the foot in order to caufe the General re- 

 oil to afcend, has been reduced to the greateft fimplicily; it is marks » 

 firm and durable, and has no communication with the oil of the 

 refervoir. 



This lamp may be ufed in diftillations and chemical prepa- 

 rations, as well as in culinary purpofes; and in general we 

 cannot do better than tranfcribe the report made to the Na- 

 tional Inftitute by Guyton, Morveau, and Charles. 



" The Clafs having charged us to examine the mechanical Report to the 

 lamp prefented by the Citizens Carcel and Careau, at the fit- * nr, * ute of 

 ting of the 21ft of iaft month, as a means of adding a new de- 

 gree of perfection to lamps with an inner current of air, as well 

 as with regard to the intenfity of light as to economy and the 

 convenience of daily ufe. 



" Lamps excited by an interior current of air, of which theHiftory of the 

 invention belongs to Citizen Argant, and which were an- ^S^ lam P« 

 pounced for the firft time in February 1784*, have produced 

 a revolution in the art of illuminating which time has ferved 

 only to confirm, as it does all thofe which, being founded on 

 true principles, receive the daily fandion of experience. 



'* A fhort time afterwards Citizen Lange thought of con-The chimney 

 trading the glafs chimney, fo as to diredthe external current improved by 

 of air nearer to the flame, by which means he determined a ftill anse * 

 more complete combuftion of the oil, and produced a more 

 brilliant light, without either fmoke or fraell. The union of thefe 

 inventions feemed to have exhaufted the fubjed, but Citizens 

 Carcel and Careau apprehended that it was poffible to renderi mprovements 

 the lamps ftill more perfed. They confidered that the beft bv Carcel and 

 lamps of this defcription do not conftantly afford the fame in- areau * 

 tenfity of light, becaufe the wick not being conftantly and alike 

 fupplied with oil, is fubjed to b-come charred; that it is ne- 

 ceffary either to raife it beyond the proper elevation, or to 

 *rim the lamp again after fome hours; andlaftly, that the glafs 





# Journal de Phyfique for that month, page 159. 



chimney 



