THE ART OF WEIGlltNG AND MEAStHlING. 621 



COMPAKISOXS OF THE Fl'NDAMENTAL EXGLtSH StaNDAKDS OF LENGTH. 



Note B. 



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

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

 Harris and Gregory, of the London mint, compared the several stand- 

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

 4-onnce weight. = All smaller weights — i grain. 

 8-onnce weiglit = All smaller weights + i grain. 

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

 32-oiiuce weight = All smalltir weights -j- 2 grains. 

 64-oiince weight = All smaller weights + 3 grains. 

 128-oance weight = AH smaller weights + 14 grains. 

 256-ounce weight = All smaller weights — 21 grains. 



The weighings which yielded these results were made at the Loudon 

 mint; the in.struments 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 Dilierence 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. 



