Observatory tent, N. A. [i.e., North American] Boundary Commission

Photograph shows Captain Charles J. Darrah, R.E., seated in tent, and Captain Robert W. Haig, R.A. of the British North American Boundary Commission posed at an astronomical observation tent with theodolite, during the marking of the boundary line between Canada and the United States; box at right marked "Capt. Darrah, R.E., No. 2".
In: Photographs of British Northwest Boundary Survey, 1858-1861.
Title from copy in album.
Another copy in album: [British Northwest Boundary Commission and Related Subjects, 1859-1861, leaf 38].
Exhibited: Rivers, Edens, Empires : Lewis & Clark and the Revealing of America, Library of Congress, 2003.