MONTANA. 
199 
MONTANA. 
TRIANGULATION STATIONS. 
CHOUTEAU AND VALLEY COUNTIES. 
BIG SANDY, BOX ELDER, LONESOME SPECIAL, AND OTHER QUADRANGLES. 
During the season of 1904 Mr. Fred McLaughlin connected the tri- 
angulation, which had been extended eastward from the Burnham 
Base to the line Galpin-Nassau of the Missouri River triangulation. 
This connection was made in Valley County near the junction of the 
Missouri and Milk rivers. 
Later in the season an area of about 1,000 square miles was con- 
trolled, extending from a little north of Burnham Base, in Chouteau 
County, south of Burnham Base, to connect with the line Recess-Ridge, 
of the Missouri River triangulation, then west to beyond the Marias 
River. The work was done under the supervision of Mr. H. L. Bald- 
win, jr.; eight old stations were reoccupied, including those of the 
Missouri River Commission, and eighteen new ones were selected and 
occupied. The latitude adopted is that of international boundary 
monument No. 318, corrected graphically for station error to the mean 
parallel of 49° 00' 04.90". 
The longitude depends upon the astronomic longitude of the school- 
house and church spire at Chinook, as determined by the United States 
Coast and Geodetic Surve}^ in the fall of 1903. 
BIO SANDY, CHOUTEAU COUNTY. 
A prominent point on ridge 3 miles east of Big Sandy Railroad sta- 
tion, 239 feet west of section corner, 0.25 mile northwest of wagon 
road. 
Station mark: An iron bench-mark post set 36 inches in the ground. 
[Latitude 48° 09' 46.48". Longitude 110° OK 49.12".] 
To station — 
Azimuth. 
Back azimuth. 
Log. distance. 
Mill 
o / n 
110 42 44. 01 
153 36 00.51 
202 55 35. 70 
149 24 57. 57 
o / // 
290 36 20.85 
333 29 27.59 
23 00 21. 51 
329 21 43. 12 
Meters. 
4. 0550209 
Sage - 
4.3870191 
Square . 
4.3065580 
Coulee 
4. 0243339 
