University of Chicago Library:
Workers mark the location to drill for a caisson
University of Chicago Library:
Drill rig moves into location, preparing to drill
University of Chicago Library:
Worker checks location before drilling begins
University of Chicago Library:
Drilling for a caisson begins
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Drilling for a caisson continues
University of Chicago Library:
Drilling for a caisson continues
University of Chicago Library:
Auger is removed to clean for further drilling
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Auger is moved back into place to continue drilling
University of Chicago Library:
Operator moves drill rig to remove auger and attach a drilling casing
University of Chicago Library:
Operator moves drill rig to remove auger and attach a drilling casing
University of Chicago Library:
The casing is drilled further into the hole for the caisson
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The auger is attached to drill within the casing
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Auger drilling hole for the caisson
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Excess water is removed from drill casing
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Drill rig operator moves casing back into place to continue drilling
University of Chicago Library:
Augers and casings used to drill holes for caissons