THE ART OF WKtGlIlNG AKD MeASTIRING. 621 



COMPAIIISONS OF THE FUNDAMENTAL ENGLISH STANDARDS OF LENGTH. 



Note B. 



By direction of the Parliamentary Committee of 1758, and in tliepres- 

 ence both of that body and of Mr. Farley, deputy chamberlain, Messrs. 

 Harris and Gregory, of the London mint, comi^ared the several stand- 

 ard troy weights of the Exchequer, with the following results: 



4-ounce weight = All smaller weights — ^ grain. 



8-ounce weight = All smaller weights + | grain. 



16-ouiJce weight = All smaller weights + i grain. 



32-onuce weight^ All smaller weights + 2 grains. 



64-ouuce weight = All smaller weights + ^ grains. 



128-ounce weight = All smaller weights + 14 grains. 



256-onnce weigiit = All smaller weights — 21 grains. 



The weighings which yielded these results were made at the London 

 mint; the instruments employed being "a very curious and exact pair 

 of scales, belonging to Mr. Harris, and the scales used at the Mint 

 for the weighing of gold." After recording the results in their report* 

 the committee continued as follows : 



Therefore beginning the Difference from the sixteen Ounce Weight, 

 and carrying it on to the greatest Troy Weight in the Exchequer, the 

 total Difference will be eight Grains and one half. 



The fourth Part of which is two Grains upon sixteen Ounces, which 

 is a Grain and a half upon the twelve Ounces or Pound Troy. 



13, p. 437. 



