40 



♦> LIGHT AFFORDED IY CANDLES, 



VII. 



On the Quantities of Light afforded by Candles in Proportion to 

 the Confumption of Material and other Qbjedls rejpecling the 

 fame. In a Letter from Mr. Ez. Walker. 



SIR, 



To Mr. NICHOLSON. 



Probability 

 that Candles 

 which bum 

 without pro- 

 ducing fmoke, 

 will afford light 

 in proportion to 

 the matter con- 

 fumed. 



Experiments in 

 proof. 



VV HEN a lighted candle is fo placed as neither to require 

 fnuffing nor produce fmoke, it is reafonable to conclude that 

 the whole of the combuftible matter which is confumed is 

 converted to the purpofe of generating light ; and that the 

 intenfities of light generated in a given time by candles of 

 different dimenfions, are directly as the quantities of matter 

 confumed. That is to fay ; when candles are made of the 

 fame materials, if one candle produce twice as much light as 

 another, the former will in the fame time lofe twice as much 

 weight as the latter. 



To prove the truth of this pofition, I made the experiments 

 contained in the following 



TABLE. 



Thefe 



