28 
C. B. Comstock— Variation of a Zine Bar 
Tables giving dates, temperatures and residuals of comparisons of 
(R. 1876) a 
cooling of 
1. (M. 
between 70° and 8 
and (M. T. 1876) made after periods of heating and 
(M. T. 1876.) Preliminary reduction. 
serait pee Feb. 7 to Feb. 14, 10.50 A. M. and kept at temperatures 
, (R. 1876)—(M. T. iv T. 1876) .— 
Date-of Tempera- | Tempera- 1876), computed, |T Pie? compte 
Domuriaon ture o ture of | minus (R. 1876)— mint on 1876), 
Peer (Ge S876 OL: T.71G2) (Mt. T i870), aiiee 
observ bane 
1881, ° ° lad B 
Feb. 16, 9.14 a.m.) 37°02 F.) 36°91 F. —0°4 —18°6 
4 16, 8.19 P.M; 36°92 36°81 —17 —17'8 
oe ty Silke As | oe be 36°41 —0°4 —17°6 
67, 7.58 P.M) + 36°32 36°21 —0°4 15°8 
“18, 9.35 a. M.| 36°12 36°21 +0°3 —14°3 
18, 8.49 P. we}. 36°32 36°21 +1°2 —17'5 
19, 9.25 a.m) 36°37 36°31 +3°0 16°4 
“ 19, 8.05 P. M.| : 36°42 36°41 +0°5 —14'4 
20, 10.38 a.M.| 36°32 36°21 +17 -—-15°6 
20, 8.37 P. M.| 36°42 36°41 +13 12° 
“ 21,:9.66 a. Ml 36°62 36°41 +3°2 —14-2 
ue 21;''8,09 Pp. Mi} 36°62 36°61 +1°0 —13°9 
22,10.12 aA. M.| 36°72 36-71 —]2 13°7 
“ 22, 8.44 P.M.) 37°12 37°21 +0°9 —12°3 
He 94. 9.32 a. S788 27°26 —0°9 —15°3 
ey hiaaiey " 3T-07 37-01 +11 148 
Oy 24. otk 36°52 36°51 +1°4 — 13°8 
2. (M. T. 1876) cooled for 23 hours: Feb. a 10.00 a. M. to Feb. 25, 9.30 4 
and kept at temperatures between —1° and —6° F, 
° ° Be ' 
Feb. 25, 7.22 Pp. M.| 36°52 35°42 +21 +2°4 
Hay Oia wk 34°91 34°82 +2°4 —0°5 
“26, 9.38 P.M.) 34:91 34°82 +40 +1°6 
6 2%, 10.22 a . 35°31 35°22 +04 +0°3 
He 2, (4382 35°91 35°81 0°6 id 17 
- (M. T. 1876) heated for 22 hours: Feb, oa 11.30 A. M. to Mar. 1, 9.10 A. M., 
being kept at temperatures between 70° and 80° F, 
° ° # p 
Mar. 2, 9.11 4.M.) 37°02 36°96 0-0 —15'8 
“9. 9.04 POM. 36°72 36°61 +0°3 — 1653 
“ °8, 9.0% 4. | 8632" |’ 3621 | —0°2 —16'0 
« 3, 8.51 P.M} 36°32 36°21 | 0-0 157 
“ 4, 9.09 a. M.| 36°32 36°21 | 24 ths 
4, (M. T. 1876) cooled for oi — Mar. 3, Pty A. M. to Mar. 4, 9.30 A. My 
being kept at temperatures be betw: and — 
pe Ie r 
Mar. 5, 8.58 P.M.| 36°72 | 36°61 + 2°6 + 6°6 
"6, 0.50.4. Mi 36°82. |. S67} + 2°2 + 6°4 
+. 6, 8.04 P.M) 37°22 | 37°16 +i +6°0 
“7,852 aM) 37°32 | 3721 +1'4 +5'1 
e 4, 1.06 P.u 8T68 | 3t61 +2°8 +5°3 
“ 8, 9.03 a.m.) 87°88 | 37°81 +3°0 +53 
