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confiderably difadvantageous ; that the length of carriages, if 

 their weight be not encreafed, is alfo a matter of indifference, 

 except in very uneven roads, and where there are deep ruts; 

 in the former long carriages are preferable, in the latter fhort 

 ones. 



I SUBJOIN a drawing of the apparatus which I made ufe of 

 in thefe experiments, and a table of the experiments, from 

 which the mechanic may draw many ufeful obfervations, and 

 which may fupply the mathematician with many curious and 

 elegant fubjedls of inveftigation. 



Your's, &c. 



R. L. E. 



TABLE. 



