[ ^?3 ] 



ment which ought to bear his name. Yet the inconveniences 

 attending the variations of the fcale have not been fufficiently 

 felt by feme fubfequent philofophers, who thus unhappily, and 

 to no purpofe, multiply the labours of the meteorologift. Mr. 

 Van Swinden's excellent treatife on thermometers enables us to 

 underftand the difcordant languages of many of them. And 

 of late centefimal thermometers (the fame as the Swedifli) have 

 been introduced in France. The degree of cold at which mercury 

 freezes was determined by Mr. Cavendifh from the experiments 

 of Mr. Hutchins. 



Ek&remeiers of the leaft fallacious kind have been devifed 

 by Mr. Cavallo. 



Of Anemometers^ though many have been invented to denote 

 the diredion and the force of winds, yet none of them has, as 

 yet, been introduced into general ufe. Mr . Smeaton's table 

 of the rapidity and force of the winds, Phil. Tranfadlions 1759, 

 feems the beft that has as yet appeared. 



20 With xc(^G.Q.txiJiaiidard(, Sir George Schuckburg has fhewn, 

 from 132 obfervations made in Italy and in England, that the 

 mean height of the barometer at the level of the fea, the tempe- 

 rature of the mercury being 55^' and of the air 62'^, is 30,04 



inches. 



