Millers Falls No.1, 3 & 5 eggbeater drills
Type Study
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Back side, showing smooth roller idler
Front side with 10 inch ruler
Handle with early lining & storage for short bits
Detail of roller
Detail of chuck and heavily used jaws

Millers Falls No.3 eggbeater drill, put up for sale on eBay by Mike Urness, who graciously permitted me to copy his photos of the drill. The short lined handle, plain main gear, 56/14 gear ratio, and riveted side handle and its washer make this a Type 1 model. It's the earliest No.3 type.

This is the fifth of these of which I am aware.  It has the no-springs, two-jaw chuck marked with the August 14, 1877, patent date.  Millers Falls quickly replaced this design with the Type 1B, whose toothed roller uses the properties of involute gearing to smoothen the operation, eliminating the cost of the separate machining setup needed for making the smooth idler here instead of just making twice as many toothed pinions as for the Type 1B.  This type has the distinct frictional disadvantage that the smooth idler is "encouraged" to turn at twice the rotation speed of the pinion, because it runs on the main shaft that is turning in the opposite direction.  In practice, it turns with the spindle under no load conditions and the opposite way uder heavy load.

This drill has had lots of use, as the rounded corners of the chuck jaws attest.