I 



PHYSICAL AND LITERARY. 109 



The body thrown up -with the double ve-i- 

 Ipcity rifes to triple the height of the firft 

 body in an equal time, and to ^ of that 

 iieight in half the time. Let the height 

 to which the firft body rifes in any time 

 be called i yard ; the height to which the 

 fecond body afcends in half that time is 

 I yard and |. The former pofition, how- 

 ever, as it was only taking a retarded 

 motion for an uniform one, was pretty 

 plaufible, and good enough to pafs upon 

 Germans and other foreigners ; efpecially 

 if they were flrangers to the Englifli lan- 

 guage. Another allowable artifice to de- 

 ceive the adverfaries, is in endeavouring 

 to make them believe, that all the world 

 knows, that, " when bodies move through 

 " a fluid, or any fofd matter, a double 

 *' force produces a quadruple efFe6l»" If 

 the word effeB were taken in its moft proper 

 fenfe, for the force communicated to the 

 fluid or foft matter, by the moving body, 

 this could never exceed the force of the 

 |3ody. A double force could never prq- 

 duce any more than a double effe<5l in its 



own 



