. 
OBSERVATIONS ON THE MAGNETIC DIP AND DECLINATION. 353 
XIII. FIRST STATION. 
This station was chosen in the shady grove of oaks north of the Washington monu- 
ment. ‘I'he precise locality of the station is N. 5° E. by needle, and three hundred and 
sixty-three yards, by measurement, from the centre of the Washington monument. 
June 9th. 
NEEDLE No. 1. 
Sarmecons, inecticay: ‘Sieecmetn. ‘Temperature, Dip observed, 
S 16 1h. O7m. P.M. 94°.5 71° 54’.13 
N 16 1 51 = 98 VAS A201 
Dip by thirty-two observations on needle No. 1, 71° 48'.52 
NEEDLE No, 2. 
Ss 16 2h. 32m. P. M. 94°.5 71° 41'.65 
oN 16 2 59 ‘ 94 .5 71° 55’.08 
Dip, by thirty-two observations on needle No, 2, 71° 48'.36 
Dip, by sixty-four observations on needles Nos. 1 and 2, 71° 48'.44 
The weather was clear, with a gentle breeze from the west-north-west during the 
observations of this day. 
1841, June 10th—Same station. 
Neepte No. 1. 
N 
S 
16 6h. 47m., A.M. 
16 1 20 a 
Dip, by thirty-two observations on needle No. 1, 
N 
Ss 
NeEEpie No. 2. 
16 8h. O7m., A.M. 
16 9° Ol by 
Dip, by thirty-two observations on needle No. 2, 
Dip, by sixty-four observations on needles Nos. 1 and 2, made June 
10, 1841. 
76°5 
79 
71° 42'61 
71° 54.47 
71° 48.49 
71° 50'.73 
71° 36°51 
71° 43'.62 
71° 46'.05 
XIV. Baltimore—gecond station.—June 10th, 1841. 
In the second square north-east of the Washington monument, under a large white-oak 
tree, which bears S. 47° W., by the magnetic needle, and is distant one hundred and 
sixty-one feet by measurement from the curb-stone which marks the south-west corner of 
Calvert and Reed Streets. 
shade. 
~) 
N 
NeEeEpD.eE No. 1. 
16 11h. 41m., a.m. 
16 0 .85 P.M. 
Dip, by thirty-two observations of needle No. i, 
Ss 
N 
NEEDLE No. 2. 
16 lh. 47m., P.M. 
16 @. 20 es 
Dip, by thirty-two observations on needle No. 2, 
85° 
86 
86° 
86 
It is the largest tree in view on this hill, and affords ample 
TY? 373 
71° 26'.46 
71° B1'.78 
11? 29’ 63 
71° 34'.73 
71° 32/18 
