DENSITIES OF THE TROY POUNDS CONSTRUCTED IN 1758. 
803 
By one observation, April 2, 1853, O in water (B= 10*4) (3200) + (1600) + (200) 
(bronze) + (64) + (16) + (2) + (l) — (8) — 0'075 grain (platinum) in air (D=10'9, 
C=ll, F=7547, E=10-8). 
O in water (^=10*16) :ii4999‘9640 grains of bronze + 747759 grains of platinum 
in air (^= 10-96, Z>=753-82). 
Hence ?;0=685-665, A0=8-40036, 0 = 5759*8333 grains. 
The weight of O is given more accurately by the following observations : — 
July 15, 1853. D= 17-55, C= 17 - 6 , F=747-55, E= 17 - 6 . 100 parts=0-3916 grain. 
Left-hand. 
Right-hand. 
Scale. 
Left-hand. 
Right-hand. 
Scale. 
gr. 
O + 0-1113 + X 
T + Y 
27*15 
T + Y 
gr. 
O + 0*1113 + X 
16*66 
0 + 0*13 +X 
T + Y 
21*06 
T + Y 
0 + 0*13 +X 
20*50 
0 + 0*13 +X 
T + Y 
21*15 
T + Y 
0 + 0*13 +X 
20*97 
0 + 0*13 +Y 
T+X 
21*70 
T + X 
0 + 0*13 +Y 
19*79 
0 + 0*13 +Y 
T + X 
22*04 
T + X 
0 + 0*13 +Y 
20*46 
0 + 0*13 +Y 
T+X 
21*41 
T + X 
0 + 0*13 +Y 
• 20*59 
OliiT— 0-13196 grain in air (^=17-61, 6=745*87). 
O displaces 0*8146 grain, T— 0*132 grain displaces 0*3231 grain of air (#= 17*61, 
6=745*87). Hence O=T+0*3595 grain. 
In air (^=18*7, 6=755*64), O £ 2 = T— 0*1363 gr., and 0*0074 gr. Therefore 
O^U— 0*1437 gr. 
By the good offices of Sir J. F. W. Herschel, at that time Master of the Mint, per- 
mission was obtained from the Treasury to weigh M in air, and to repeat the obser- 
vations with the stereometer for finding its volume with more care and more leisurely 
than on the former occasion, when they were made in Mr. Bingley’s house. 
By three series of comparisons made with the stereometer. 
May 11, 12, 1855 . . . ^;M=^;0+4*33=690*00 
September 16, 1843 
r^;M=^;C — 0*6 =688*96 
UM=t;0+5*3 =690*97 
According to a mean of all three results, the volume of M at 0° is equal to the 
volume of 689*98 grains of water at its maximum density. 
Comparison of M with T, July 14, 1853. 
D=18*2, 
C=18*3, F 
=743*2, E= 
= 17*7. 100 parts=0*3916 
grain. 
Left-hand. 
Right-hand. 
Scale. 
Left-hand. 
Right-hand. 
Scale. 
M + 0^*06 + Y 
T + X 
15*30 
T+X 
M + 0^()6 + Y 
24*55 
M + 0*04 + Y 
T + X 
20*02 
T + X 
M + 0*04 + Y 
18*80 
M + 0*04 + Y 
T + X 
20*31 
T + X 
M + 0*04 + Y 
18*97 
M + 0*04 + X 
T + Y 
19*05 
T+Y 
M+0*04 + X 
17*59 
M + 0*04 + X 
T + Y 
18*12 
T+Y 
M + 0*04 + X 
18*44 
M + 0*04 + X 
T + Y 
18*94 
T+Y 
M + 0*04 + X 
19*01 
M :i 2 :T — 0*0415 grain in air (^= 18*28, 6=741*52). 
5 N 
MDCCCLVI. 
