118 



forces balance, Oi' ©qualize caf!] (rflier. At tliat 

 moment the weajKm would full towards the 

 ground, were it not for its Hat surface and rota- 

 tory motion ; but in conseq[uence the centre 

 of gravCly Wng m iplaced that hmlt alway# 



present its "broad >urfacp to tin- air, it (';niiiot 

 descend ])crpendicidarly, but slides down the in- 

 clined plane, u]) which it has been thrown, in 

 consequence of the whirling motion contiiuiing 

 aibr the projectile tm^ im mmi i so that if 

 properly thrown, it iraH pass over the head of 

 the thrower, and often to a considerable distance 

 behind him. On the same princij)le, a hoop 

 thrown irom the hand with a spinnhig-niotion 

 mmrdst will h^n, ti& r^m l3^(m il Wa^^ 

 the gi^oiaM^ md dtedE ih& msitm, ihdugli ntft 



€0 familiar instance, of a ball fired from ;i 

 musket, the barrel of which has been bent to the 

 lefty being carried at long distances considerably 

 id ike Ti^ht of the object aimed at, in consequence 

 of i^ r^aMosi of thdhdll oiiiti asds^ cavtee^hy 

 the friction against the right side of the barrel 

 overcoming the |m)jeetih' force, and thus Car- 

 rying it across the luic of aim, 



** The bommarang may be iUnstrated in a 

 tpoitt, by merely istitting a piece of isard! Into 

 ^0^6 sha]>e as the diagram ; then holding it be- 

 tween the iinger and thumb oi' the left-hand, at 



