824 PROF.W. H. MILLER ON THE CONSTRUCTION OF THE NEW STANDARD POUND. 
A 
— 
grains. 
1239-88467 
B 
= 
1239-88651 
C 
= 
1239-88709 
D 
1239'88618 
F 
= 
799-92526 
G 
= 
499-95990 
H 
= 
359-96598 
K 
= 
79-99241 
L 
= 
79-99109 
M 
79-99258 
N 
79-99333 
R 
■=. 
39-99625 
S 
= 
39-99629 
In the summer of 1845, after the adjustment and comparison of PS 200 times with 
T4-0'645 grain together with each of the weights A, B, C, D in succession, the com- 
parisons of the auxiliary weights with each other and with T presented some unac- 
countable discordances. By a most troublesome repetition of the weighings with 
different combinations of the weights, it became evident that A, C, F were subject to 
a very sensible fluctuation. This was at last found to be due to the circumstance 
that the platinum of which they were made had been very badly prepared, and con- 
tained cavities filled with a substance which attracted moisture from the air. In 
order to remove this injurious matter, they were digested in boiling water and then 
placed in a platinum capsule over a spirit-lamp, the heat of which caused a brown 
liquid to escape from the openings in their surfaces. After repeating this process 
several times till the coloured liquid ceased to appear, and till it was supposed that 
the whole of the deliquescent substance was removed, it was found that A, C and F 
had lost 0'04 grain, O'OSl grain, and 0‘04 grain respectively. It now became obvious 
that all the weighings into which either A, B or F entered, must be repeated. This 
involved the rejection of the observations for determining the weight of PS, and the 
comparison of PS with the kilogramme, as well as those for comparing the auxiliary 
weights themselves. The weights lost by A, C, F were made up by the addition of 
bits of wire. In the following comparisons A denotes the weight marked A-1-0’04 
grain, C the weight marked C+0’031 grain, F the weight marked F-1-0'04 grain. 
June 26, 1846. 100 parts =0*26694 grain. 
S=A + B + C + D-|-F. 
S+Y, T+X. 
T+X, S+Y. 
S + X, T+Y. 
T+Y, S+X. 
19-97 
19-80 
18-00 
18-24 
20-04 
19-40 
17-44 
18-30 
20-57 
18-66 
17-60 
18-54 
20-41 
18-89 
17-95 
18-61 
19-75 
18-65 
17-90 
17-96 
19-96 
19-55 
17-82 
18-60 
19-99 
18-80 
17-27 
18-16 
18-92 
18-52 
17-17 
18-41 
18-41 
18-59 
18-27 
18-14 
18-94 
17-22 
17-60 
18-29 
196-96 
188-08 
177-02 
183-25 
20(T+X)=20(S + Y) + 8-88 parts 20(T + Y)=20(S + X)-6-23 parts. 
40T= 40( A + B + C + D + F) -h 0-00708 grain. 
