Table of the Times of Vibration of Horizontal Needles at different Stations. 
MADE BY CAPTAIN BACK DURING HIS LATE ARCTIC EXPEDITION. 397 
Therm. 
© 
° § 
46-0 
1 • 
35-0 
l ! 
51-0 
30 
4p 
cb 
CD 
40 
cb 
CD 
Time of 
one vi- 
bration. 
s 
1*8525 
3-15357 
T* 
CO 
cb 
3-1650 
3-1423 
o 
GO 
GO 
CD 
mean 
8*8250 
[-8944 
d 
Time. 
uo P3 LO iO 
w CO cb d* df CM 
ph ph <M <M 
S co <d co 
d 
no 
I 
6 15 
8 21 
i 
5 57 
7 25 
40 
Hf cb 
^ Pi 
40 
01 
T3 
CO 
s 
01 
0) 
H3 
o3 
s 
01 
r d 
CCJ 
a 
01 
0 1 
2 58-5 
5 55 
U CO 
40 CM 
o 
o 
£ 
Arc. 
° : : ** • co 
s 
ft 
H* CM 
; CM 
01 
is 
c n 
o 
01 
40 
O • dn 
CM * 
40 
; cb 
oi 
bD 
C 
01 
N 
o 
hI 
Time. 
40 4p ip ip 
=»<m cb cm © cb 
^ ph (JDCH 
c O pH CM <M CO 
a 
.2 
C3 
> 
0) 
0 59-5 
3 6 
3 37-5 
CM • GO 
h* : 
O * <M 
0 15 
3 25 
5 31-5 
0 30 
2 4-3 
5 12-8 
C 
.2 
> 
H 
01 
in 
S 
cd 
> 
0) 
c 
.2 
> 
u 
01 
0 33 
3 59-5 
6 17 
0 4-5 
3 0 , 
5 56-5 
0 47 
3 20 
d 
u 
< 
ooo : o : 
CO (M pH 
J3 
O 
o 
20 
10-75 
9 
o : o 
CM PH 
40 
40 ^ 
O 40 pH 
20 
-O 
O 
1 
-Q 
o 
o 
-Q 
o 
o 
40 
4p CM 
O 40 
CM 
. 40 
O : rd 
CM 
20 
No. of 
vibra- 
tions. 
O O O O O 
co »>* c; o 
OOO 
^ 40 
O 00 O 
CM 
OOO 
o o 
OOO 
co cs 
* 
OOO 
CO 40 
ooo 
o o 
00 
Time of 
day 
nearly. 
d 
£ co 
s: co 
VH 
d 
40 
CO 
d 
O 
40 
I'M 
d 
O 
40 
& 
d 
40 
o* 
CO 
a 
d 
S 
d 
GO 
s 
d 
CM 
Therm. 
o 
56-0 
40 
cb 
40 
46-0 
| 45-25 
40 
<6 
40 
30-0 
71-0 
82-0 
o 
4p 
4>» 
CD 
40 
M 
di 
CD 
40 
; ^ 
40 
■hH 
Time of 
one vi- 
bration. 
S 
i 4-3167 
40 
00 
cm * 
GO 
dt< 
o 
© 
7-4941 
(M 
Cl 
CO 
| 7-6281 
8-8909 
13-0286 
18-500 
16-775 
40 
fi CM 
C3 f-H 
£ 
4-5588 
Time. 
40 dn <M C5 
(MCO PH CO 
S 'O N O H Cl 
hhhCKM 
40 40 40 ip 
^ cm 40 cm cb 
co cm io 
co o cm co 
H pi Cl Cl CM 
CO 
Arc. 
o 
6-5 
i 5 
i 2-75 
6 
£ 
oi 
d 
£ 
£h 
m s 
8 9 
10 19-* 
11 47 
13 57 
15 24-5 
»P 40 
<M © CO © cb 
CM Tfi pH io 
GO © CM to 
12 35 
21 16-5 
23 45 
40 CO Ip 
40 © © 
Tt< 
CO © pH 
-i-hCI 
12 32-5 
16 14-5 
12 56-3 
19 17 
20 33-5 
15 21 
16 50-5 
0 24 
15 23 
8 11 
13 29 
o 
A 
Arc. 
O 
15 
6-5 
• 40 .* : 
>0 40 40 
CM CM 
cb cb ch 
* * <M 
* CO 
40 * 
CO Ol 
4p 
O CM 
: 40 
Time. 
m hcOh(MQ 
40 CO 
2 O CO ^ CO GO 
0 41 
1 26-5 
4 40-5 
6 16-5 
7 53-5 
0 4 
7 35 
11 20 
0 35-5 
6 51 
9 21 
Cl CO (M 
40 Ol 
o co co 
0 13 
6 36 
7 52 
0 32-5 
2 1-5 
6 28-5 
4p »p 
40 W 
CO ^ 
O 40 
0 15 1 
21 50 
0 9-5 
5 45 
16 56 
0 11-5 : 
15 28 
19 19 
0 34 
5 53 
Arc. 
oO • © cb 40 
CO 'ClHH 
o •* : © • 
<M • • PH • 
o o 
M pH 
o o : 
<M pH * 
20 
io 
0 O • 
01 pH • 
o : o 
(M * 
40 
O CM 
O CM 
O* 
20 
10 
2-25 
40 
20 
No. of 
vibra- 
tions. 
o o o © o 
co 40 co © 
o o o o o 
HIONC5 
OOO 
CO © 
OOO 
40 W 
OOO 
co 40 
ooo' 
40 CD 
OOO 
PH 
o o 
o o 
w 
OOO 
CM CD 
ooo 
^ 40 
o o 
Time of 
day 
nearly. 
a 
d 
£ ° 
-C <M 
a 
d 
o 
o 
a 
d 
co 
<m 
a 
d 
40 
s 
d 
o 
pH 
d 
(M 
pH 
CO 
d 
K 
40 
a 
d 
O 
o* 
O 
a 
d 
40 
d 
40 
40 
s 
d 
o 
40 
r5 
«*' 
OD 
Therm. 
o 
56-0 
45-5 j 
51-0 
O 
40 
Time of 
one vi- 
bration, 
S 
4-445 
7-7000 
7-6893 
4-6632 
. 
d 
£ 
P 
m s 
7 31 
11 12 
13 26 
14 10 
14 54 
d 
Cj 
s 
01 
13 36-5 
29 1 
23 52 
d 
T3 
CJ 
a 
01 
13 36 
18 43-5 
d 
ns 
2 
01 
d 
03 
g 
01 
d 
CJ 
£ 
01 
d 
T3 
cO 
s 
01 
d 
TJ 
03 
2 
01 
d 
C3 
s 
01 
o o 
CO 40 
o 
| Arc. 
o • '9 
* CD 40 * 
o 
* 
l/l 
40 40 
co cb <m 
01 
£ 
* co 
01 
& 
01 
ft 
t/1 
3 
01 
01 
? 
01 
£ 
4p 
w «5COhCOph 
^ Tti CO 
£© co co co »>* 
o> 
c u 
£ 
| Time. 
.2 
> 
Jh 
q> 
0 46 
7 12 
11 3 
.2 
> 
0) 
0 47 
5 55 
12 18-5 
.2 
CS 
> 
u 
01 
.2 
CO 
> 
u 
01 
.2 
C3 
> 
u 
9 
.2 
> 
01 
o 
03 
> 
a 
.2 
> 
J-l 
2 
0 14 
7 15 
Arc, 
oO to • o • 
Ol pH * r-H • 
o 
o 
& 
40 
Ohn 
0* PH 
o 
o 
20 
5 
o 
o 
17 
O 
O 
fc 
o 
o 
o 
o 
O 
O 
o 
o 
20 
No. of 
vibra- 
tions. 
o o o © © 
40 GO © © 
OOO 
40 GO 
OOO 
^ Cl 
o o l 
Time of 
day 
nearly. 
* 
d 
£ S 
H co 
x: ph 
& 
d 
40 
cm 
zz sj 
a | 
GO E 
Date. 
1833. 
Feb. 7. 
Nos.l&3. 
Feb. 9. 
Lozenge 
April 19. 
| Oct. 11. 
1834. 
Feb. 8. 
Cl* 
CJ 
o 
July 2. 
1 
July 23. 
July 31. 
(M 
to 
< 
Aug. 12. 
1 
1836. , 
Feb. 12. ' 
Place at which 
the observa- 
tions were 
made. 
— 
| London, the 
S Admiralty 
j Garden. 
Montreal, 
Island of 
St. Helen’s. 
6 
| Fort 
| Reliance. 
1 Fort 
| Reliance. 
f; i 
i 
Fort 
Reliance. 
1 Fort 
e Reliance. 
[ Musk-Ox 
I Rapid. 
1 
•p; dt! R^oii | 
£ Point 
| Reaufort. 
8 i 
1 Montreal 
| Island. 
jd 
'bb 
o 
o 
1 London, the 
| Admiralty 
| Garden. 
Time of 280 vibrations, from 10 th to 290 lh vibration = 1352 seconds. 
