ANNALS 



OF 



PHILOSOPHY, 



DECEMBER, 1823. 



Article I. 



Remarks on different Gas Works, and the Substances from which 

 Gas is usually prepared. By Timothy Dewey, Esq. of New 

 York. 



(To the Editor of the Annals of Philosophy.) 

 [Mr. Dewey, during his mission to this country, for the pur- 

 pose of acquiring information on the subject of gas lighting, 

 having visited numerous establishments, 1 requested him to fa- 

 vour me with answers to a few questions on particular points, 

 and to some of them he has replied in the annexed communica- 

 tion.— JEeftY.] 



DEAR SIR, N0V..9, 1823. 



The note you addressed to me on the 7th inst. was duly 

 received, and the following hasty sketch must be my reply. I 

 have assisted in making experiments on coal and oil gas at 

 Whitechapel-road, and think it a duty to assist in correcting a 

 prevaihng error respecting the illuminating power of oil gas, on 

 which must depend its relative value compared with coal gas. 

 You have given me an opportunity to do so, and I thank you 

 for it. I was deputed by a highly respectable Company in the 

 city of New York to examine the gas works in this country, 

 preparatory to constructing one for lighting that city. The 

 time I have been able to bestow on the subject has been muck 

 too short to allow me to acquire a minute practical acquaint- 

 ance with the subject in all its details. I have visited many 

 gas works in Great Britain, and several in France, and have the 

 satisfaction to state, that I have received the most flattering 

 attention from the proprietors and managers of all the works I 



New Series, vol, vi, 2d 



