470 
PROFESSOR SCHUMACHER ON THE LATE 
15. These weighings give, using the same reductions as before for P, and taking 
the mean according to the number of comparisons : 
No. of 
Comp. 
Comparisons. 
b. 
t. 
No. of 
Comp. 
Comparisons. 
b. 
t . 
1829. 
June21. 
8 
gr- 
K = U + 0-03292 
29-698 
66-51 
1829. 
July 9. 
14 
K = U + 0 : 03359 
29-773 
65-64 
22. 
10 
K = U + 0-03589 
29-700 
65-43 
11. 
16 
K = U + 0-03482 
29-409 
64-96 
July 7. 
32 
K = U + 0-03321 
29-683 
64-45 
30. 
12 
K = U + 0-03378 
29-633 
65-10 
Mean of 92 
K = U + S 0-03389 
b. t. 
29-646 65°-09 
This result differs considerably from that given by Capt. Kater by his last com- 
parisons with his two weights, by which he found K = U + 0’0259 gr. (see § 5.). 
It is already there stated that K seems not to have undergone any change in the 
mean time ; and its invariability is yet further proved by fifty comparisons made in 
October 1829 and February 1830 with K n , by which I found 
No, of 
Comp. 
Comparisons. 
No. of 
Comp. 
Comparisons. 
1829. Oct. 7. 
1830. Feb. 11. 
20 
14 
K = K n + 0-02079 
K = K n + 0-01921 
Mean of 50 K 
1830. Feb. 13. 
14. 
= K n + 0-01998 
12 
4 
gr. 
K = K n + 0-01916 
K = K n + 0-02106 
This differs but 0‘0Q02 grains, and of course nothing of importance, from the result 
obtained in 1828, when I found (see § 3.) K — K n + O'0 198 grain. 
16. After having compared K with the imperial standard troy pound, Capt. Nehus 
compared with it a brass pound which I had ordered at Mr. Robinson’s. I denote 
this pound by S. b . The comparisons were made with the same instruments as before 
specified, which served for all the weighings made in London. They are as follow. 
With Robinson’s 
Balance. 
No. 
Comparisons. 
Barom. 
Attached 
Therm. 
Therm. L. 
Therm. E. 
No. 
Comparisons. 
Barom. 
Attached 
Therm. 
Therm. L. 
Therm. R. 
gr. pt. 
gr. pt. 
0 
1. 
S. b =U- 0-01 +0-25 
30-225 
64-2 
65-0 
65-2 
11. 
S. b = U -0-01 -0-30 
2. 
s.»=u— 0-01 0-00 
12. 
S. b = u-0-01-0-10 
3. 
S. b =U— 0-01 0-00 
13. 
S. b =u— 0-01+0-15 
65-9 
66-0 
4. 
S. b =U — 0-01— 0-35 
14. 
S. b = U— 0-01 —0-15 
5. 
S. b =u- 0-01 -0-30 
15. 
S. b =U— 0-01+0-15 
6. 
S. b = U— 0-01— 0-15 
...... 
65-8 
66-0 
16. 
S. b = U-0-01-0-I0 
7. 
S. b =u -0-01 +0-20 
17. 
S. b =U — 0-01+0-60 
8. 
s. b = u— 0-01— 0-30 
18. 
S. b =U-0-01+0-10 
9. 
S. b = U — 0-01 — 0-20 
19. 
S.» = u- 0-01 +0-25 
10. 
S. b = U -0-01 -0-25 
20. 
S.» = u- 0-01 -0-90 
30-188 
64-6 
gr. 
pt. Barom. 
Att. Th. 
Th. L. 
Th. E. 
1829, August 2. 
Mean of 20 S. b - U - 
001 
- 0-070 30-2065 
640.4 65°-57 65 o .73 
21. 
S. b =U— 0-01+0-30 
29-585 
63-0 
64-2 
64-5 
31. 
S. b =U— 0-01+0-65 
22. 
S. b =U — 0-01 — 0-85 
32. 
S. b =U— 001+0-15 
23. 
S. b =U-0-0 1-0-25 
33. 
S. b =u— 0-01+0-40 
24. 
S.» = U — 001-0-35 
34. 
S. b = U — 0-01 — 0-80 
64-8 
65-0 
25. 
S. b =U-0-01 0-00 
35. 
S. b = U- 0-01 +0-25 
26. 
S. b = U— 0-01+0-15 
64-8 
65-0 
36. 
S. b =U-0-01+0-10 
27. 
S. b =U-0-01+0-10 
37. 
S. b = U— 0-01+0-75 
28. 
S. b =U-0-01 0-00 
38. 
S. b = U— 0-01 +0-55 
29. 
S. b =U-0-0 1+0-30 
39. 
S. b =U— 0-01— 0-65 
30. 
1 S. b = U — 0-01 —0-50 
40. 
S.»=U-0-01-0-10 
29-940 
63-8 
gr. 
pt. Barom. 
Att. Th. Th. L. Th. R. 
1829, August 5. 
Mean of 20 S.» - U - 
0-01 + 0-010 29-7625 
63°-4 64°-6 64°-83 
