66 Dr. Moll on the Comparison of 



However, as I consider the last weighings much more accu- 

 rate than the first, I have no hesitation in adopting 15432.265 

 of Mr. Robinson's grains as a very near approximation to 

 the value of Mr. Van Swinden's brass standard kilogramme. 

 From this we have the British Imperial troy pound equal to 

 373.244 grammes ; the British troy ounce, 31. 1037 grammes ; 

 the British troy grain, 0.0648 grammes ; and the kilogramme, 

 equal to 2 Ibs. oz. 3 dwt. 0.265 gr. 



Besides this duplicate of the original kilogramme, I had an 

 opportunity of examining many standards of the same unit of 

 weight, said to be very accurate. They are the following: 



2. A kilogramme sent by the French administration of the 

 then imperial mint, at the time when Napoleon incorporated 

 this country in his empire. This weight was intended to be 

 used as a standard in the mint at Utrecht ; it was made by 

 M. Gandolfi, balancier de la Monnaie de Paris, and was 

 called kilogramme modele. It was stamped V. G., the initials 

 of the maker, and M., signifying module. 



3. A kilogramme, also sent by the French imperial mint 

 administration in Napoleon's time, to the mint at Utrecht, 

 toade also by Gandolfi, and marked V. G. 



4. A kilogramme in brass, made, it is said, with great accu- 

 racy by M. Fortin in Paris, and belonging to the ministry of 

 the interior of this country. 



5. A kilogramme in brass, being the standard made use of 

 at present in the mint at Utrecht, and made in this country 

 by T. A. Nagel, inspector of weights and measures. 



6. A kilogramme, by the same maker, belonging to the 

 Royal Institute of Holland, and marked in consequence with 

 the private stamp of that body. 



7. A kilogramme, by the same maker, belonging to me, 

 and stated to be made with great care. It is marked No. 2. 



8. A kilogramme, by the same, belonging to me, and said 

 to be very accurate. 



These different kilogrammes, expressed in Mr. Robinson's 

 troy grains, gave the results contained in this Table : 



