new standards of weights and measures. 25 



Deductions from the preceding comparisons. 3 .'iAvl 



The mean of the differences of the two 6 lb. weights from 

 the six troy pounds is - - - — ,0020 grs. 



But the sum of the errors of the six troy 



pounds is ----- + ,0039 



Therefore the mean of the errors of the 



two 6 lb. weights is - - - + >ooi9 



The first comparisons of the five avoirdupois pounds with 

 one of the 6 lb. weights + 440 grains gave for the 

 difference - . - - - - — ,o6so grs. 



With the other 6 lb. weight + 440 grains, 



the difference was - - - + ,0260 



The mean is - - — ,0185 

 But the mean error of the two 6 lb. weights is +,0019 



Therefore the sum of the errors of the five 



avoirdupois pounds is ^ ^ - — ,0166 



The sum of the differences between No. 1. and the other 

 avoirdupois pounds being ,019 grains, and all in defect, wires 

 of the following values were enclosed in each weight ; viz. 



In No. 2. - - ,002 grs. * 



3. - - ,002 



4. - - ,006 



5. - - ,007 



Total - ,017 



MDCCCXXVI. E 



