26 PRIMARY TRIANGULATION AND PRIMARY TRAVERSE, [bull. 216. 
MANCHESTER, HILLSBORO COUNTY. 
(Not occupied.) 
A stone observatory in a park in northeast part of the city of Man- 
chester. 
Station mark: Center of observatory. 
[Latitude 43° 00' 04.3". Longitude 71° 26' 21.1".] 
To station 
Azimuth. 
Back azimuth. 
Log. distance. 
o / ,/ 
o 
Meters. 
Unkonoonuc 
80 47 50. 7 
260 41 43.6 
4.09187 
Derry 
335 37 56.2 
155 40 27. 1 
4.08553 
MASON, HILLSBORO COUNTY. 
A triangulation station of the United States Coast and Geodetic 
Survey south of Mason village on a hill locally known as ".Barrett 
Hill." 
Station mark : A hole drilled in solid rock around which is drilled 
a triangle. 
[Latitude 42 45' 09.81". Longitude 71" 48' 45.96".] 
To station- 
Azimuth. 
Back azimuth. 
Log. distance. 
Mount Vernon . 
Federal 
216 27 84.9 
248 11 24.9 
268 00 51.9 
36 33 27.4 
68 18 46.9 
88 14 89.0 
Meters. 
4. 29670 
4. 202 IS 
Nashua . 
4. 44278 
MOUNT VERNON, HILLSBORO COUNTY. 
(Not occupied.) 
A flag pole on dome of large summer hotel in town of Mount Ver- 
non and a short distance east of village of same name. 
[Latitude 42 53' 45.8". Longitude 71° 40' 07.4".] 
To station- 
Azimuth. 
Back azimuth. 
Log. distance. 
Mason 
36 33 27.4 
214 02 28.9 
287 38 37.9 
343 17 51.9 
216 27 34.9 
34 03 58.6 
107 43 32.9 
163 19 21.9 
Meters. 
4 29670 
Unkonoonuc 
4 06739 
Turkey 
4 08779 
Federal 
4 01968 
