Millers Falls No.1, 3 & 5 eggbeater drills
Type Study
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Millers Falls No.1 eggbeater drill.
Type 3 - modified to show off the Jacobs chuck, patented in 1902.
Note the cross-drilled hole in the spindle used to help the installer of the Jacobs chuck, which is not rotated on the spindle in normal use - one tightens it with the key shown stowed in the chuck.