The Dominion Observatory in Ottawa, Ontario, Canada. Inset: Dr. W.F. King, Chief Astronomer of the Dominion; in general charge of the expedition.
Links:
[1] http://www.rasc.ca/category/archivetags/dominionobservatoryottawa
[2] http://www.rasc.ca/category/archivetags/wfking
[3] http://www.rasc.ca/category/image-galleries/national-archives/archives-1905-solar-eclipse