DESCRIPTION 



NEW METHOD OF DETERMINING 



WEIGHTS OF GASES 



BY MR. JOHN POTTER. 



(Read March 9th, 1837.) 



JHLAVING understood that an apparatus, capa- 

 ble of determining the weights of gases to a 

 considerable degree of nicety, was a desideratum 

 in chemical science, I am induced to propose 

 the following contrivance, which I conceive to 

 be tolerably well adapted for that purpose. This 

 instrument, in its construction and mode of use, 

 is much like that of the hydrometers, and in- 

 struments of a like nature, used to determine the 

 specific gravities of fluids. It differs from them, 

 however, in some essential particulars, as will be 

 seen from the annexed drawing and the follow- 

 ing description. A, A, is a hollow globe of 

 glass, from the lower part of which projects a 

 2b2 



