IMPERIAL STANDARD TROY POUND WEIGHT. 
471 
No. 
Comparisons. 
Barom. 
Attached 
Therm. 
Therm. L. 
Therm. R. 
No. 
Comparisons. 
Barom. 
Attached 
Therm. 
Therm. L. 
Therm. R. 
gr. pt. 
gr. at. 
41. 
S. b =U-0-01+0-30 
30-036 
63-2 
64-2 
64-7 
51. 
S. b =U— 001-0-10 
42. 
S. b =U -0-01 +0-25 
52. 
S. b =u — 0-01+0-40 
43. 
S. b =U-0-01+0-40 
53. 
S. b =u — 0-01+0-35 
44. 
S. b =U-0-01 0-00 
54. 
S. b = U— 0-01 —0-45 
45. 
S. b =U— 0-01— 0-55 
64-8 
65-0 
55. 
S. b =U -0-01 -0-25 
46. 
S. b =U- 0-01 -0-45 
56. 
S.» = U-0-01 000 
47. 
S.»=U- 0-01 -005 
57. 
S. b = u -0-01 -0-00 
48. 
S. b =U — 0-01+0-30 
58. 
S. b =U- 0-01 -0-20 
49. 
S. b = U— 0-01— 0-25 
59. 
S. b = U— 0-01+0-45 
50. 
S. b = U — 0-01 — 0-95 
60. 
S. b =U— 0-01 0-00 
gr. 
pt. Barom. Att. Th. Th. L. Th.R. 
1829, August 6. 
Mean of 20 S. b - U - 
0-01 
- 0-040 30-036 
63°-2 64°-5 64°-85 
These weighings give (using the same elements of reduction as before, and giving 
to b and t the significations already mentioned, as well as taking the means according 
to the number of observations), the following results : 
No. of 
Comp. 
Comparisons. 
b. 
t. 
1829. 
August 2. 
20 
S. b = U - 0-01072 
30-167 
65-09 
5. 
20 
S. b = U - 0-00990 
29-727 
64-20 
6. 
20 
S. b = U - 0-01041 
30-000 
64-22 
Mean of 60 .. 
...S. b — U — 0-01034 
29-965 
64-50 
17- These were the comparisons of my own pounds, which Captain Nehus made 
at Somerset House. He compared also a platina troy pound belonging to the Royal 
Society, and the brass pound of the Royal Mint, with the now lost imperial standard 
troy pound. The platina troy pound was made, upon the President’s orders, by 
Mr. Cary # . I shall first give its comparisons with the imperial standard troy pound, 
premising only that I designate it by the letters RS. 
With Robinson’s Balance. 
No. 
Comparisons. 
Barom. 
Attached 
Therm. 
Therm. L. 
Therm. R. 
No. 
Comparisons. 
Barom. 
Attached 
Therm. 
Therm. L. 
Therm. R. 
gr. pt. 
gr. pt. 
1. 
RS= U— 0-02+1-10 
29-380 
64-8 
65-6 
65-9 
11. 
RS=U- 0-02+0-80 
2. 
RS= U— 0-02+1-10 
12. 
RS=U -0-02+0-85 
3. 
RS= U— 0-02+0-05 
13. 
RS=U -0-02+0-65 
4. 
RS=U — 0-02+1-35 
14. 
RS= U— 0-02+0-50 
5. 
RS-U-0-02+0-55 
15. 
RS= U— 0-02+0-70 
66-3 
66-6 
6. 
RS=U— 0-02+0-55 
16. 
RS=U— 0-02+1-20 
7. 
RS=U- 0-02+ 1-55 
66-0 
66-2 
17. 
RS=U— 0-02+0-60 
8. 
RS=U- 0-02+0-95 
18. 
RS= U— 0-02+1-85 
9. 
RS=U — 0-02+0-30 
19. 
RS= U— 0-02+0-70 
10. 
RS=U — 0-02+0-30 
20. 
RS=U — 0-02+0-95 
29-434 
65-2 
66-0 
66-5 
gr. 
pt. Barom. Att. Th. Th. L. Th.R. 
1829, July 12. 
Mean of 20 RS - U - 
0-02 + 0-825 29-407 
65°-0 66°-0 66°-3 
21. 
pt. 
RS = u - 0-00 
29-810 
66-0 
67-0 
67-2 
28. 
RS = U - 0-10 
22. 
RS = U - 0-60 
29. 
RS = U 000 
23. 
RS = U - 0-05 
30. 
RS = U - 0-50 
24. 
RS = U 0-00 
31. 
RS = U - 0-35 
25. 
RS = U + 0-10 
32. 
RS = U 0-00 
26. 
RS = U - 0-35 
67-5 
67-8 
33. 
RS = U + 0-30 
27. 
RS = U + 0-15 
34. 
RS = U - 0-30 
29-832 
66-8 
67-8 
68-1 
Pt. 
Barom. Att. Th. Th.L. Th.R. 
1829, July 14. 
Mean of 14 
. RS - t 
- 0-12143 29-821 66°-4 67°-4 67° 7 
* For the purpose of making this new platina pound, Mr. Cary was furnished with some of the platina which 
Dr. Wollaston had given to the Royal Society : hut it seems that Mr. Cary did not employ this platina, but 
used some other kind; the reason for which has not been sufficiently explained. — F. Baily. 
