J ou 



OF 



NATURAL PHILOSOPHY, CHEMISTRY, 



AND 



THE ARTS. 



SEPTEMBER, 1802 



ARTICLE I. 



■Defcription of a cheap andfimplc Apparatus or Bloiv-pipe, in which 

 the Flame of Oil or Tallow is impelled by the Vapour of Alcohol. 

 From a Correfpondent. 



To Mr. NICHOLSON. 

 SIR, London, July 9, 1 802. 



\J SEFUL as the blow-pipe is for the profeffed mineralogift Inconveniences 

 and chemift, as well as for the amateur of the fcience, it is, o^eblow-pipc, 

 however, liable to the inconvenience of requiring one hand of tutes commonly 

 the operator to be employed; befides, that perfons of weak ufed# 

 lungs, or not well accuftomed to its ufe, find it laborious, even 

 when they attempt to manage it according to the directions 

 given by Bergman and Engftrom ; more efpecially, when a 

 continued ftream of air is required for fome time. For this rea- 

 fon, fome have recourfe to a bladder filled with air, and force 

 it out by preffing the bladder between the arm and their body ; 

 others ufe a fmall pair of double bellows, to be fixed upon the 

 table : others again employ a receiver, or rather gazometer, in 

 the form of Mr. Watt's hydraulic bellows. But all thefe means 

 are not always ready at hand, or not eafily portable- to accom- 

 Vol. Ill,— September, 1802. B pan/ 



