DENSITIES OF THE TROY POUNDS CONSTRUCTED IN 1758. 
795 
readings of the scale observed. The thermometer B was suspended with its bulb 
in a horizontal plane through the centre of gravity of V. The thermometer C was 
in the balance case. F denotes the reading of Ernst’s barometer, E that of the 
attached thermometer. 100 parts of the micrometer scale =0’2 grain nearly, when 
V is suspended in water, or when the hook alone is suspended in water, and the 
right-hand pan contains 5053*3 grains. 
Observations for finding the density of V. 
184.5, July 7. 
Weighing of V in air. 
100 parts= 0*3302 grain. 
S=A-|-B + C + D + F. 
pt. 
gr- 
pt. 
V + 0*31 + XiiS + Y-|- 0*50 
V+ 0*31 + Y£:S + X + 0*20 
+ 0*25 
+ 0*30 
— 0*50 
+ 0*40 
0*00 
+ 0*65 
+ 0*20 
+ 1*00 
— 0*20 
+ 0*80 
-0*10 
+ 1*15 
0*00 
+ 0*75 
+ 0*20 
+ 0*80 
+ 0*20 
+ 0-70 
+ 0*055 
+ 0*675 
gr- 
gr- 
V + 0*31£!:A + B + C + D + F+0*0012. 
Vii5759*l60 grains of platinum in 
air (<=16*13, ^»=76l*27). 
Weighing of V in water. 
1845, April 2. 
V and hook in water. 
In right-hand pan. 
B. 
C. 
F. 
E. 
gr- 
Scale. 
0*14 
18*0 
8*5 
8 
765*8 
8*5 
0*14 
20*0 
• 
0*14 
20*0 
0*14 
19-6 
0*18 
26*5 
0*10 
12*3 
8*45 
0*14 
20*1 
0*14 
20*0 
0*14 
20*3 
0*14 
20*2 
8^ 
8 
7^ 
8*5 
0*140 
19*7 
Hook in water. 
In right-hand pan. 
gp, Scal6* 
A + B + C + D + L + (8) + (4) + (1) + 0*80 20-0 
0*80 18*5 
0*80 22*5 
0-80 19'2 
0*80 19*4 
0*80 19*6 
0*80 20*2 
0*800 19-9 
V in water (B=8*47) — A-t-B + C-l-D + L + (8)-|-(4) + (l)-|-0*7396 in air (C — 8, F — 765*8, E — 8*5). 
5 M 
MDCCCLVI. 
