(150 ) 
Variations de l'intensité magnétique verticale observées à Bruxelles, de M 
10 minutes, et pendant 24 heures, à partir du 20 janvier 1841, à 10 b. 7 ms 
du soir, temps moyen de Gœttinque. ï 
(Le thermomètre est celui de Fabrenheit. ) 
7:50”. 
7/50”. 17/50”. 
HEURES, mm _—— | —, 
In. v. |Tem.f In. v. ee In, v. |Tem. 
5750”. 4750". 57/30 
Le, PS T , 
In.v. | Tem.} In. v. |Tem 
10h.s, . [+4-0,811/3797 |+.1,139/37°7 |+-0,796]38°0 |+- 0,480] 38°3 [+ 0,431]383 
11 — |+0,429/38,0 + 0,395138,0 |+-0,398/38,0 |+- 0,372] 38,0 |+-0,313/38,0 
Minuit, . |4-0,362/38,0 |4-0,463/38,0 {+-0,538138,0 |+-0,425| 38,0 |+-0,387/38,4 
1h, m,!+0,328|38,3 |+0,432138,3 L+0,545/38,3 |4-0,425| 38,5 |+ 0,280/38,5 É 
2 — [0,133 H-0,055/38,3 H-0,088/38,3 [-0,119) 38,3 {+-0,157]38,0 |4-0,361k$ 
2 — .]—3,163144,6 Î—2,802/44,0 Î—2,275|43,7 |—1,963| 43, 43,1 
3 — À+0,550/38,0 |+-0,287/38,0 |— 0,121138,0 |— 0,127 —0,126/38,0 Î— 0,193 
4 — |—0,181/37,8 |—0,210/37,6 | —0,093/37,5 |H-0,091| 37,5 ]+-0,091/37,5 ]4-0,089! 
5 — {+0,079/37,5 [+-0,022/38,0 Î+-0,079/38,0 Î+- 0,070! 38,0 |+-0,070/38,0 Î+-0,105| 
6 — ÀL0,124/38,2 |0,099/38,2 |+0,099/38,2 | 0,074| 2 +0,151[38,0 + ousil | 
7 — |+0,132/38,0 [4-0,054/38,0 |-0,042|38,0 Î+-0,042| 38,0 À 0,150/38,0 | 0,181/! | 
8 — À+0,025/38,0 |+.0,072/38,0 |+-0,072/38,0 |— 0,027 —0,116]38,0 —0,158/8)} 
9 — À_0,625/38,3 | 0,695/38,3 —0,725|38,3 |— 0,730] 38, 39,0 | 
19 — 0,878 39,3 Î—1,023/39,6 |—1,065/40,0 |— 1,394] 40, 40,5 | 
11 — À—1,961/41,5 |—1,961/41,7 |—2,201/42,0 |— 2,201 42,6 | 
Midi —2,214/42,6 |—2,140/42,7 |—2,339/42,8 À 2,579! 43, 10|44,0 fl 
1 — À-2,298 143,5 |— 2,395143,7 | 2,533144,0 |— 2,626| 43, 44,0 l | 
| 
3 — À—1,685!42,5 |— 1,661142,3 | 1,833142,4 |—1,736| 42,4 |—1,905/42,4 | 1,774] 
"4 bals —_1,435/42,3 À 1,200/42,0 |— 1,290! 41,7 |—1,191|41,4 | 1,000!) 
pe Be ne —1,159/41,0 À—1,251/41,0 | » | 41,0 Î—1,180|41,0 |—1,180/fh 
FER à ane —1,187/41,0 |—1,187|41,0 À—1,134| 41,0 |—0,723l41,0 |— 0,630 
5 TE Ph —0,458/40,5 À 0,540/40,3 D—-0,462| 40,3 |—0,443/40,2 | 0,4060 1h 
8.2 ESA —_0,437/40,2 | 0,268/40,2 |—0,978| 40,2 |—1,059/40,0 |— 1,070 
CE. +0,549/40,0 +-0,729/40,2 Î+-0,581/40,2 Î+-0,513] 40,2 -0,177/40,2 | 0,032 | 
