Millers Falls No.1, 3 & 5 eggbeater drills
Type Study
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Millers Falls No.3 Type 1A eggbeater drillMillers Falls No.3 eggbeater drill, found for me by Sandy Moss. 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.

Call it Type 1A, for the smooth idler that was added by Millers Falls to support the side thrust of the main gear.  I don't know if this roller or the "Little Rail Road Car Wheel" of the No.2 series of Millers Falls eggbeater drills came first, as neither concept was patented by Millers Falls, and the present roller never appeared in any catalog of which I am aware.

This is the fourth of these of which I am aware.  It has the no-springs, two-jaw chuck marked with the August14, 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.