Of the Light manifested in Combustion. 217 



and placed vertically in such a manner as to compose 

 a wick whose horizontal section forms a rectangular 

 cross. And in the first experiment made with this 

 new lamp its four united flat wicks were cut sloping 

 upwards from without, in such a manner that the 

 centre of the cross was about one tenth of an inch 

 higher than its extremities. This was done, in order 

 that it might be less difficult to cause the lamp to burn 

 steadily with a very small flame. 



This lamp is furnished with a small glass chimney, 

 which serves as a blower, and renders the flame of the 

 lamp very bright, clear, and vivid, and effectually pre- 

 vents both smoke and smell. 



Four experiments were made with this lamp, and 

 their results were as follows : 



By comparing the results of these experiments, it 

 appears that with the consumption of a given quantity 

 of oil nearly three times as much light was produced 

 in the thirteenth experiment as in the tenth, although 

 the combustion appeared to be quite as perfect in the 

 one as in the other. 



Several other similar experiments were made with 

 lamps of different forms and dimensions, and with 

 similar results ; but without stopping here to describe 

 them particularly I shall proceed immediately to give 

 an account of two or three subsequent experiments 



