IMPERIAL STANDARD TROY POUND WEIGHT. 
465 
No. 
Comparisons. 
Barom. 
Attached 
Therm. 
Therm. L. 
Therm. R. 
No. 
Comparisons. 
Barom. 
Attached 
Therm. 
Therm. L. 
Therm. R. 
gr. pt. 
o 
gr. pt. 
171. 
S.P = U-0-01 +0-45 
29-736 
63-9 
64-9 
65-2 
186. 
S.P = U-0-01+0-10 
172. 
S.p = U-0-01 +0-35 
187. 
S.P =U -0-01 +0-55 
173. 
S.p = U-0-01+0-50 
188. 
S. p = U— 0-01+0-20 
174. 
S.p=U— 0-01+0-40 
189. 
S. p = U— 0-01+0-40 
175. 
S.p = U— 0-01+0-80 
i 190. 
S.p=U— 0-01+0-60 
176. 
S.P = u-0-01 -0-25 
65-0 
65-2 
i 191. 
S. p = U— 0-01+0-55 
177. 
S.P = U- 0-01 +0-70 
i 192. 
S. p = U— 0-01+0-90 
65-0 
65-3 
178. 
S.p = U— 0-01+0-35 
1 193. 
S. p = U— 0-01+0-35 
179. 
S. P = U— 0-01+0-75 
1 194. 
S.p = U-0-01 +0-35 
180. 
S. P = U— 0-01+0-20 
195. 
S.p = U— 0-01+0-65 
181. 
S.p = U— 0-01+0-20 
196. 
S.p=U— 0-01+0-15 
182. 
S.p = U— 0-01+0-20 
197. 
S.p = U -0-01 + 1-00 
183. 
S. p = 17-0-01 + 1-10 
198. 
S. p =U— 0-01— 0-05 
184. 
S.P = U— 0-01+0-55 
65-1 
65-4 
199. 
S.p = U-0-01 +0-75 
185. 
S.p = U -0-01 +0-55 
200. 
S.p = U— 0-01+0-70 
29-710 
63-8 
gr. pt. Barom. Th. Att. Th. L„ Th. R. 
1829, August 4. Mean of 30 S. p = U - 0-01 + 0-4683 29-723 63°-85 65°-0 G5°-27 
8. It remains now, for the purpose of obtaining the results of these comparisons, 
to determine the values of the parts or divisions of the graduated arc of the balance 
under the pressure of one troy pound in each scale, for Ramsden’s and Robinson’s 
balances, to reduce the indications of the barometer to absolute heights at 32° tem- 
perature, and to find the errors (if any) of the thermometers employed. 
9. For determining the values of the divisions or parts of the graduated arc of 
Ramsden’s balance, the following observations were made, one troy pound being in 
each scale. 
June 21. 
21. 
grs. pts. 
0-04 = 4-575 
0-04 = 6-250 | 
Mean o 
June 21. 
21. 
f the two day 
grs. pts. 
0-04 = 4-620 
0-04 = 4-550 
s 0-32 gr. - 
June 21. 
22. 
39-590 parts 
grs. pts. 
0-04 = 4-570 
0-04 = 4-900 
, or 1 part = 0-0 
June 22. 
22. 
)808 gr. 
grs. pts. 
0-04 = 5-750 
0-04 = 4-375 
The centre of gravity of the balance was altered. 
June 23. 
23. 
23. 
23. 
24. 
0-04 = 6-738 
0-04 = 6-033 
0-04 = 6-575 
0-04 = 7-279 
0-04 = 6-138 
Mean of tl 
June 24. 
24. 
24. 
24. 
28. 
le seven day. 
0-04 = 5-375 
0-04 = 5-700 
0-04 = 5-500 
004 = 5-425 
0-04 = 5-875 
June 28. 
29. 
29. 
July 1. 
1. 
109-568 pai 
0-04 = 4-950 
0-04 = 6-550 
0-04 = 5-325 
0-04 = 6-850 
0-04 = 5-525 
•ts, or 1 part = 0 
July 4. 
4. 
5. 
5. 
•00657 gr. 
0-04 = 6-880 
0-04 = 6-825 
0-02 = 3-875 
0-02 = 2-150 
The centre of gravity of the balance was altered. 
August 2. 
2. 
2. 
0-02 = 2-800 
0-02 = 2-200 
0-02 = 1-100 
Mean of 
August 2. 
4. 
4. 
the two day 
0-02 = 1-800 
0-02 = 1-950 
0-02 = 2-100 
August 4. 
4. 
4. 
17*450 part 
0-02 = 1-300 
0-02 = 1-500 
0-02 = 1-400 
s, or 1 part = 0-C 
August 4. 
1146 gr. 
0-02 = 1-300 
Of course we must employ, for the reduction of the comparisons, the following 
values of the parts : 
June 21, 22. ] part = 0-00808 gr.'i 
June 23, 24, 28, 29, July 1 , 4, 5. 1 part = 0-00657 i- Ramsden’s balance. 
August 2, 4. 1 part = 0-01146 J 
The centre of gravity of Robinson’s balance was never altered during the course of 
the observations, so that upon that account there seems no objection to employ the 
MDCCC XXXVI. 3 o 
