Adler Planetarium under construction, exterior, dome roof installation

Image of the Adler Planetarium under construction, taken near the base looking upward toward the dome. Three men can be seen on the dome exterior, installing light concrete slabs. 'Kaufmann and Fabry' is printed on the front of the phtograph in the lower left corner, and the number '29-7451-3' is printed in the lower right corner. 'Adler Planetarium, Grant Park, Chicago, roofed with Featherweight Concrete Light Six Channel Slabs, manufactured and erected by - FEDERAL CEMENT TILE COMPANY, Chicago, ILL.' is typewritten on the back.