900 PROF. W. H. MILLER ON THE CONSTRUCTION OF THE NEW STANDARD POUND. 
Apparent weight of Q in water, weighed with platinum weights. 
Water. Air. 
t. 
gr- 
t. 
b. 
17*3 
Q 1^2:4362*5201 
18*41 
759*79 
17*44 
Q:r2. 4362*5942 
18*54 
759*79 
18*14 
Q £2= 4362*8345 
18*51 
766*91 
17*46 
Qii: 4362*5878 
18*44 
763*99 
17*71 
Q£2: 4362*6886 
18*59 
763*33 
17*65 
Qii 4362*6702 
18*64 
761*90 
Comparison of Q with PS. 
During the comparison of Q with PS, the zero of the scale of the barometer was 
305 millimetres above the centre of gravity of the weights, consequently 0’03 mm. 
must be added to the reading of the barometer. F denotes the reading of the baro- 
meter, E that of its attached thermometer. The thermometers C, D were suspended 
in the balance-case. PS will be designated by the letter I. The weight of 0'4 grain 
used with Q on the 3rd and 10th of August, was the 0’4 grain of Robinson’s 5^-inch 
balance ; on the 5th it was the 0’4 grain of Barrow’s balance ; on the 6th it was the 
sum of the 0*3 grain and OT grain of Barrow’s balance ; on the 7th it was the 0‘4 grain 
of Robinson’s 10^-inch balance; on the 11th it was the sum of the 0‘3 grain and 
OT grain of Robinson’s 5|-inch balance. Z=0T gr.-]-0'3 gr.+OT gr. of Robinson’s 
5^-inch balance-pOT gr.-l-0'3 gr.+OT gr. of Barrow’s balance+OT gr. of Robinson’s 
10|^-inch balance ; (2) the 2-grain weight of Barrow’s balance. The readings increase 
on placing a small weight in the left-hand pan. 
100 parts=0‘399 grain. 
z, ( 2 ). 
(2), Z. 
3*21 
3*07 
3*22 
3*01 
3*16 
2*90 
¥59 
8*98 
6Z =6(2) + 0*00243 grain. 
Z=(2)-i-0-000406 gr., (2) = 1-999597 gr., Z=2-000003 grains, iZ=0'4000006 gr. 
Hence the mean value of the 0-4 grain used may be taken as exact. 
August 3, 1846. 
100 parts=0*31355 grain. 
D. 
c. 
F. 
E. 
I + Y, Q + 0*4gr. + X 
Scale. 
21*16 
21*64 
Q + 0*4gr. + X, I + Y 
Scale. 
18*57 
17*93 
17*30 
16*57 
17*51 
16*41 
22*51 
19*41 
19*49 
19*24 
20*4 
20*3 
22*15 
760*0 
21*5 
22*15 
20*6 
20*5 
22*42 
20*65 
20*65 
20*6 
20*6 
760*5 
21*5 
I + X, Q + 0*4 gr. + Y 
1+0*02 gr.+X, Q+0*4gr.+Y 
1+0*01 gr.+X, Q+0*4gr.+Y 
23*12 
17*09 
19*55 
20*19 
Q + 0'4 gr. + Y,I + X 
Q + 0*4 gr. + Y, I + 0*02 gr. + X 
Q+0*4gr. + Y, 1 + 0*01 gr. + X 
19*37 
20*57 20*5 760*25 21*5 101 + 0*05 gr., 10(Q+ 0*4 gr.) 208*84 10(Q+ 0*4 gr.), 101 + 0*05 gr. 184*96 
20(Q + 0*4 gr.) 201 + 0*1 gr. + 23*88 pts. 
