Main Exhibition Building-site of centre transept 1 silver albumen print; 21 x 26 cm. Mounted on backing board. Title on label: Memorial Hall. Date photo taken : Sept. 6, 1875. Architect: Memorial Hall -- H.J. Schwarzmann. Exterior view of Memorial Hall under construction as seen from the Main Building site. The Main Building Annex to the left and the United States Photo Gallery to the right are also under contruction. Lumber litters the ground and a ditch is in the foreground.