Well, it looks like you're right, Jack, though if you check the second ebay link the pic shows a much heavier cast base. Still, hand driven? They must have been working every guy in the plant in 15 minute shifts on that machine before going back to their regular jobs, unable to lift their right arms.
Here's a conversion that's in the same spirit, but much better done:
This is (or rather, started out as) a Yerkes & Finan power-driven solid chisel mortiser. It was originally flat belt driven, with a crank at the top of the column driving a solid chisel. A century or so after it was built, it aquired the little side growth you see, the head of modern table top mortiser. Stepping on the pedal raises the table, pushing the work into the mortising chisel. IIRC, the mortiser motor is attached to the spot where the original drill was mounted.
Kirk