TABLE IV.—The mean Diurnal Variation of the Compass House by Lieutenant Hood, R.N., Lat. 53° 56' 40' N., foLro fnogu;r 1M02o°n t1h6s', 4w1e"r eW o.b sDerivpe. d8 3a°t C\2u!mberland 50".
Months 8 A .M . 9 A .M . . 1 P .M . 4 P .M . 8 P .M . 1 2 p .M .
1 8 2 0 n , ,f O t O / O ! 1 0
February 1 7 16 Ó E 1 7 11 2 1 7 9 9 1 7 12 4 17 1 3 O
March 1 7 1 4 9 1 7 9 5 1 7 9 7 y 17 1 2 1 17 1 3 4
April 1 7 I S 7 E 1 7 8 8 1 7 9 6 1 7 1 2 3 1 7 13 9
May 1 7 16 9 1 7 7 8 1 7 8 3 1 7 1 4 . 7
TABLE V.—Monthly Abstract Lofo nDgi.u r1n3a1l° V6a' r0i0at''i oWn., oDbsiepr v8e6d° a5t 8F' o4r2t "E. nterprise. Lat. 64° 28' 24" N.,
V ariation E ast V ariation E ast V ariation E ast V ariation East V ariation E ast V ariation E ast V ariation Easl
I H I O / •
1 8 2 1 At 1 0 A .M . N o o n 2 P .M . 3 P .M . 6 a n d 5 p .m . 9 P .M . Midnight J anuary 3 6 2 7 5 7
9 A .M .
3 6 2 2 0 9 3 6 1 2 39 36 1 2 0 3 3 6 18 5 7
5 a n d 4 p .m .
3 6 16 0 9 3 6 0 9 09
February 3 6 3 1 4 5
8 A .M .
3 6 2 1 5 7 3 6 1 7 2 7 36. 1 5 51 3 6 1 3 0 3
4 P .M .
3 6 1 3 51 3 6 11 5 7
March 3 6 2 9 36
7 A .M .
3 6 1 7 21 3 6 2 1 0 9 3 6 1 0 4 5 3 6 0 6 15
5 P .M .
3 6 0 6 3 7 3 6 12 3 3
April 3 6 0 7 4 5
7 A .M .
3 6 0 6 0 3 3 6 0 2 51 3 6 0 0 15 3 5 5 5 15 3 5 4 0 0 3
May 3 6 4 2 0 3 3 6 2 9 4 5 3 6 2 1 0 9 3 6 1 4 5 7 3 6 1 2 0 9 3 6 11 3 3
Mean Variation observed with the Needle attached to the Transit Instrument, placed at a greater distance
from the Buildings at Fort Enterprise.
Between May 12 and 8 and 9 A.M. Noon 4 and 5 p .m. 9 and 10 p .m. June 13,1821 . . 3o7 85 5 E 37 24 i ! ' 37 26 1 37 22 8
TABLE VI.—Monthly AbstLraact.t 6o1f °D 1iu1r' n8a"l NV.a, riLaotinogn., 1o1b3s°e r5v1e'd 3 7a"t WMo.ose-Deer Island, Slave Lake,
M
V ariation E a st V ariation E ast V ariation E ast V ariation E ast V ariation East, V ariation E as
\ .1 8 2 ^ .,
fpr o° m 7‘
to 9 o r 1 0
l.M .
A .M . Noon < Py
P .M .
o I 5 P .M . 9 P .M .
pi / h
Midnight
January . . • . , 2 5 4 2 52.. 2 5 4 2 2 3 25 4 1 12 ■ 26 4 0 4 2 25 3 9 5 5
February . . . 1 2 5 4 0 10 ; 2 5 3 8 56 2 5 3 8 0 9 2 5 39 2 7 1 25 3 9 0 7 ;, ! 25- 3 7 2 6
March . . . . 2 5 4 0 5 2 2 5 3 9 0 6 2 5 3 7 5 0 2 5 3 7 16 25 3 7 4 7 2 5 3 5 0 2
April . . . . 2 5 4 2 16 2 5 4 0 2 3 2 5 8 8 2 1 2 5 38 10 25 38 4 9 2 5 ‘ 3 8 15
ean o f th e th r e e c o m p le te 1 M o u th s , F e b . M a r c h , and / 11 2 £ 41 06 2 5 39 2 8 ► 25 3 8 0 7 .2 5 3 8 18 25 38 3 4 2 5 3 7 14
REMARKS ON TABLE No. VII.
T he following Table, No. VII., contains the results of the observations made
during the progress of our journey in America, and along the Arctic Sea, which have
been used in the construction of the maps. The intermediate parts were laid down
by the courses corrected for variation and the estimated distances. The observations
for latitude and longitude were made by myself, except those to which a name is
affixed. The sun’s azimuth, from whence the variations were deduced, were generally
observed either by Mr. Back or Mr. Hood, whilst I took the corresponding
altitudes with the artificial horizon. The letters B,, H., and F., denote by whom the
observations were taken.
The chronometers were either worn in our pockets, or, in the colder weather, suspended
round our necks, inside of our dresses, and were necessarily much shaken
from our mode of travelling; but, on the whole, they preserved their rates more
steadily than might have been expected, especially that of Baird’s, No. 1733, We
ascertained their rates as often as an opportunity offered, and those assigned to
them, on leaving Cumberland-House, Fort Chipewyan, and Fort Enterprise, were
fixed by a series of observations. Previous to the commencement of our journey from
the latter place in particular, care was taken to render them as correct as possible.
Several observations of the transit of the sun and the star Arcturus over the meridian,
as well as equal altitudes and separate observations of the sun’a lower and upper
limbs were observed. The longitudes, from whence their errors for mean Greenwich
time were deduced at each of the different stations, were procured in the following
manner : That of Cumberland-House was ascertained by the mean of the chronometers,
shewn by an observation on the day of our arrival. The longitude of Fort Chipewyan
was determined by several lunar observations on each side of the moon, the mean
of those of Q E. d being 111° 17' 38" W., and of those of © W. D 111° £0' 12" W.
The longitude of Fort Enterprise was obtained in the following manner : The mean
of the chronometers gave 113° 2' 37" W., at the time of our arrival in August, 1820 ;
but that of 1733, which was found by subsequent observations to have preserved its
rate more steadily than the others, was 113° 4' 26" W. The mean of several sets of
lunars in this month gave 0 E. ï 113° 3' 56" W., but the corresponding observations
© W. d could not then be obtained.
In the month of May, 1821, several sets of lunars were observed, on each side of
the moon, which gave a result of 113° 8' 12" W. The mean between this longitude
and that shewn by all the chronometers, is 113° 5' 24" W., and between it and the
result of 1733 is, 113° 6' 19''. Fort Enterprise was therefore placed in 113° 6' 00" W.