74 
1834, July,. 
August, 
1835, 66 
Sept. 
1836, August, 
Sept. 
1837, ‘* 
6é 
1832, Oct. 
1833, June, 
July, 
Oct. 
1834, July, 
1835, Aug. 
Sept. 
1836, Aug, 
Sept. 
1837, Oct. 
66 
By 3 chronometers west of the State House, 
By 2 chronometers west of Antiquarian Hall, Worcester, 
By 42 chronometers compared with the State House, 
Worcester, 
4 
~~ PLP Lh Pp 
SURVEY OF MASSACHUSETTS. 
Mean of 42 chronometers, 
2 
ae WOO REDD DW 
Mean of 32 chronometers, 
Add Longitude of Worcester, 
32 
66 
66 
66 
II. 
Mean of 74 chronometers, (Mansion House,) 
Add. reduction to the church, 
” 
Longitude of the church by 74 chronometers, 
Or, from Greenwich, - 
6™ 185,97 
18 .20 
16.78 
17 .96 
17 .04 
3™ 215,58 
22 .82 
21.61 
21.72 
22.61 
20 .66 
21.91 
21 .29 
21.14 
20 .98 
22.72 
+3 21.54 
+2 56.08 
+ 6" 175,62 
+ 6. 17.81 
17 .62 
+6 17.72 
—0 0.92 
+6 16.80 
450 33.40 
On the 22d of August, 1836, the immersion of the star 7 ¢ behind the dark limb of 
the moon was observed, by a friend, in Dorchester, and by myself at the Mansion House. 
The immersion took place at Dorchester, mean time, at 10" 23™ 20°90, and at the Man- 
sion House at 10" 14" 57°.46; from which I have deduced the difference of longitude 
between the two places of observation to be 6" 17°.20. 'To which add 0°69 for the longi- 
tude of Dorchester, and subtract the reduction 0°.92 + 0°.23, and we have, for the differ- 
ence of the longitude of the State House and church, 6" 16°.97, which differs only one- 
sixth of a second from the results given by the seventy-four chronometers. 
1832, October, 
1833, June, 
Pittsfield, (First Congregational Church.) or the Latitude. 
16 altitudes of © gave - 
6 
10 
a ™, gave 
66 66 
- 
« Canis Majoris gave 
O 
66 
« Urse Minoris 
42° 26’ 51/4 
57 
9 
5 
7 
53 44 
3 
8 
