38 Experiments on the Relative Intensities 



To be enabled to judge of the relative quantities of 

 light actually produced by the candle in the two experi- 

 ments, it will suffice to know that, in order to counter- 

 balance this light at the field of the photometer, it 

 required in the former experiment the consumption of 

 141 parts, but in the latter only the consumption of 64 

 parts of olive oil. But in the former experiment no 

 parts, and in the latter 1 14 parts of tallow, were actually 

 found to be consumed. These parts were 8i92ths of 

 a Bavarian pound. 



From the results of all the foregoing experiments 

 it appears that the relative expense of the under-men- 

 tioned inflammable substances, in the production of 

 any given quantity of light, is as follows : 



Equal parts 

 iii weight. 



Beeswax. A good wax candle, kept well snuffed, and burn- 

 ing with a clear bright flame 100 



Tallow. A good tallow candle, kept well snuffed, and burn- 

 ing with a bright flame 101 



The same tallow candle burning very dim for 



want of snuffing 229 



Olive oil. Burned in an Argand's lamp 1 10 



The same burned in a common lamp, with a 



clear bright flame, without smoke .... 129 



Rape oil. . Burned in the same manner 125 



Linseed oil. Likewise burned in the same manner .... 120 



I should have been very glad to have made the 

 experiment with whale oil, but there was none to be 

 had in the country I inhabited at that time (Bavaria). 



With the foregoing table, and the prices current of 

 the therein-mentioned articles, the relative prices of 

 light produced by those different materials may very 

 readily be computed. 



The light of a wax candle, for instance, costs just 



