TO Mr Tregaskis on the Expansion of Vapour. 



ing point, where one degree does not produce an increase of 

 force equal to the 1-1 40th part of an inch, the result must be 

 almost inappreciable. It may not be unworthy of remark, that 

 there are only twelve terms in the series from the bottom of the 

 table up to the temperature which Dr Murray states to be 

 equal to red-hot iron, fully visible in daylight, — a temperature 

 which will change vapour into permanent gas; so that this 

 table, which reaches the utmost limit of vapour, has only 12 

 terms, 5 of which (almost half the table) have been proved by 

 experiment. 



Table of the Elastic Force of Vapour. 



Additional 

 Distance from the ^ ^§5^^^ J^^" Degrees on Inches of Atmospheres. 



