266 



EXPANSIBILITY. 



lished a table in vol. 51, of the Phil. Trans.: 

 with the intention of shewing the velocity with 

 which air has the power of moving, and which 

 is known under the appellation of wind* This 

 table is founded on a great number of observa- 

 tions made by himself in the course of his prac- 

 tice in erecting windmills. 



Miles per Hour. Feet per Second of time. Names, 



* " l. Wind may be considered the genus, of which there are 

 a variety of species ; viz. hurricanes, storms, whirlwinds, squalls,, 

 variable winds, land and sea breezes, and ending in a calm, 

 in which there exists an equilibrium of expansibility in the 



