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48″ Schmidt--form work
Moving dome trucks on observing floor to position for hoisting to rail level
Mirror preparation
Mirror preparation
Pouring concrete slab of the observing floor of the 200″ dome
48″ Schmidt--exterior view with shutters open
Mt. Wilson comparator, side view
Torch cutting phantom dome parts
Gear on left side of grinding machine, for operating to and fro motion of bridge
Workmen positioning 200″ disc
Using vibrator to settle backfill on the ground floor of the 200″ dome building
West horn of horseshoe girder
Coude slit unit--light source
Tandem trucking of horseshoe section
Lifting second yoke girder