O Col. Beaufot/ Oft a new Anemometer, [Jai^. 



all exhibit equal magnetic powers, and take up equal quantities 

 of iron filings. So that the magnetism seems directly as the 

 quantity of electricity which they transmit. And when in a 

 highly powerful voltaic battery, wires of the same diameters and 

 lengths, but of which the best conducting is incapable of wholly 

 discharging the battery, are made, separately and successively^ 

 lo form the circuit, they take up different quantities of" iroa 

 tilings, in some direct proportion to their conducting powers. 



Thus, in one experiment, two inches of wire of -jL of an inch 

 being used, silver took up 32 grains, copper 24, platinum 1 1 , and 

 iron S^, 



Article IL 



On a new Anemometer. By Col. Beaufoy, FRS. 



(To the Editor of the Annals of Philosophy.) 



DEAR SIK, Biuhey Heath, Dec. 14, 1821. 



In the last number of the Annals^ you did me the favour of 

 inserting the description and engraving of a new anemometer, 

 which, it has been suggested, would be rendered more complete^ 

 by the accompanying tables of the impulse of the wind. 

 1 have, therefore, the pleasure to forward the annexed. 

 I remain, dear Sir, truly yours, 



Mark Beaufoy. 



ANEMOMETRICAIi TABLE. 



Column 1, contains the revolutions of the fusee. Column 2, 

 the value of each revolution in pounds avoirdupoise, and decimal 

 parts of a pound. Column 3, the differences, one-tenth of which 

 is. the value of ten divisions, and these last numbers being 

 divided by 10, g"ive the value of one division. 



Example 1. — Suppose when four pounds are hung to the cord 



