Millers Falls catalog describes this drill as:

Cocobolo handles; malleable iron, black enameled frame; large gear painted red; other metal parts nickeled.

Hollow End Handle, with screw cap, shaped so tool may be used as a breast drill, and spare bits. Removable side grip handle. Cut Gears with adjustable friction roll to equalize bearing. Pinion of Steel, Ball Thrust Bearing.  Reinforced spindle housing.

Chuck of Star pattern with 3 jaws opening with springs, which are Protected From Injury and Will Not Get Out of Order, and Closing Evenly on, and Centering Accurately, round shanks from 0 to 3/8 inch in diameter.