( 320 ) 



then, the tliread be twilled round, and the bullet lifted up from 

 the glafs, it will be {ee.n by its motion on its own axis, to drive off 

 the particles of wax : and hence alfo w^e may gather this conclufion, 

 that the revolution of the earth round its axis, is wifely defigned to 

 drive off the vapours and moillure from its furface on all lides. 



AB C D E F, reprefents the glafs globe as it lies on the cufliion, 

 and G H, are the pieces of twine gathered up and twifted together. 

 I, is the leaden bullet fattened to the thread K LD, paffing through 

 a hole in the cork or ftopper. 



'In the bottom of the globe at A, and round about the leaden bullet, 

 -are the particles of wax ; but when with the hand at H, the \\hole is 

 lifted up from the cufliion, then by the twilling of the twine, the globe 

 will be fwiftly whirled about, and the particles of wax be driven to 

 the fides of the globe, as at B F. But when the revolution of the 

 globe is fuddenly Hopped, we Ihall immediately fee that the parti- 

 cles of wax quit the lides of the globe, and are hurried about in an 

 irregular manner one among another, and then colled; round about 

 the bullet, where at length they fubfide and fettle. 



In the next place, I remove the cork Hopper and draw it on the 

 thread D M N P, as far as the place marked N O M, and then take 

 hold of the thread at P, with my finger and thumb, and gently 

 Awitl it, having firll laid down the twine G H, by the fide of the 

 globe, and then lifting up the thread N P, in like manner as I had 

 before done the twines G H, lb as to raife the bullet a very little 

 from the bottom, we Ihall fee how the bullet, in its motion, drives 

 off from it the particles of wax. 





