to ascertain a Standard of Weight and Measure . 173 
(§. 41.) I shall now endeavour to shew the proportion of the 
weights that I have used, compared with the standards that 
were made by Mr. Harris, Assay Master of the Mint, under 
the orders* of the House of Commons, in the year 1758. They 
are kept in the same custody with Mr. Bird’s scales of length, 
and appear to have been made with great care, as a mean re- 
sult from a great number of comparisons of the old weights in 
the Exchequer, which have been detailed at length in that re- 
port. Mr. Harris having been of opinion that the Troy pound 
was the best integer to adopt, as the standard of weight, I ven- 
ture to conclude that this was the most accurate, and most to 
be depended upon, of all the various weights and duplicates 
that he made for the use of this committee ; for he made them 
of 1, 2, 4, 8, 16, lb. and of j-, 1, 2, 3, 6 ounces. It will there- 
fore be sufficient for my purpose, to compare the 1 and 2 pounds 
Troy, and their duplicates, with the weights of Mr. Trough- 
ton. 
I did this, June 2d, 1797; ^ ie barometer being at 29,72 inches, 
and thermometer 67°. 
Troughton’s weights, 
lb. grains. grains. 
1 
grams 
3.751 
>74j 
The standard weight of 1 Troy pound, or! 
5760 grains, marked 1 7 58, kept at the ! : 
House of Commons, in a small box by f 
itself, by Mr. Benson, weighed - j 
A duplicate of the preceding, kept with 1 — 1 3,70! 
some other weights, in a box marked B J ,67 j 
The mean weight of the Troy pound, from these 
two - 
>=57 6 3>74i5 f \ 
- 57 6 3> 6 $5 
• . l 
: 57 6 3 ’ 7 1 & 
/3-/M/3 
e 
/ Cl • f y / 0 a 
See the report referred to in the note of page 148. 
t 
