364 OBSERVATIONS ON THE MAGNETIC DIP AND DECLINATION. 
NEEDLE No. 2. 
Shik enh oe enti: Readin gs. atin ‘Temperature, Dip observed. 
N 16 lh. 53m., P.M. fafa patsy 77° 44/46 
NS) 16 2240 a 57 .5 77° 41’.09 
Dip, by thirty-two observations on needle No.2, . . . » hee adie te 
Dip, by a mean of sixty-four observations on heeties Nos. 1 and 2 We 1 a ee 
In the observations of this station I was joined by Captain William Robinson of the 
Royal Engineers, British astronomer attached to the joint commission for the demarca- 
tion of the boundary under the treaty of Washington. We read the needles alternately, 
and the final result is a mean of our respective readings. 
Slight rain, with occasional sunshine during the observations. 
XX XI. 1843,—October 2d. At the head of Lake Petteiquaggamac or Beau Lac, of the 
St. Francis River, Maine. 
The position of the instrument is immediately on the right bank of the river, near its 
entrance into this lake, and N. 55° E.., by needle, and two hundred and five feet from 
the astronomical station of last year, at the head of this lake. Latitude 47° 22’ 40”, N.; 
Longitude 69° 03’ 21”, W. 
NEEDLE No. 1. 
8 16 9h. 22m., a.M., 49° 77° A@’.93 
N 16 10 21 eo 49 77° 45'.8 
Dip, by thirty-two observations on needle No.1, . . . . . . 77° 46.85 
NEEDLE No. 2. 
Ss 16 11h. 39m., A.M. 48°.5 77° 46'.15 
N 16 0 33 P.M. 49 77° 48'.34. 
Dip, by thirty-two observations on needle No.2, . . . . 1 9 het oe 
Dip, by a mean of sixty-four observations on needles Nos. 1 ee S°. Tit 
Wind north-east and squally; raining during the observations. ‘The instrument was 
well protected, by a good water-proof tent, free from any iron fixtures. 
XXXII. 1843,—October 4th. At the outlet of Lake Pohenagamook. 
At astronomical station No. 13, of the year 1842. Maine and Canada boundary 
Latitude 47° 27’ 33”.5, N.; Longitude 69° 13’ 19”, W. 
Neepie No. 1. 
N 16 10h. 28m., A.M. AB8° 77° 4'7' 53 
i) 16 11. 1S : AO 5 77-01! 08 
Dip, by thirty-two observations on needle No.1, . . . . . . 77° 49'.53 
NEEDLE No. 2. 
N 16 11h. 55m., a.M. 52° 77- 50',.97 
Ss 16 UC aia 49 5 77° 4'7'.00 
Dip, by thirty-two observations on needle No.2, . . . . . . 77° 48/98 
Dip, by a mean of sixty-four observations on needles Nos. 1 and 2,, '7'7° 49.2 
Cloudy, with frequent showers of rain. Wind north-west, fresh 
