Millers Falls No.1, 3 & 5 eggbeater drills
Type Study
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Millers Falls No.3 eggbeater drill; Type 1A

T. Ralph Stumpe found and photographed this even rarer example of the first No.3 model, which has a solid main handle to go along with the smooth roller idler that Millers Falls tried on their eggbeater drills in order to counter the tendency of the main and pinion gears to separate at the pitch line during heavy drilling.  Ralph found this one and another example of the lined-handle Type 1A, so there are now five known examples of that type and only one of the present type.  The solid handle was always an option with the Type 1, No.1 Millers Falls drills, though. 
Thanks, Ralph, for permission to use your images.  They have been edited for color, contrast, and size to improve viewability.
This side of Ralph's No.3 drill has all the features (solid face on the main gear, washer plus pin to hold the crank handle) of a Type 1 No.1 drill, but with a conical roller added on an extension of the main spindle to support the main gear.Front side of Ralph's solid-handled No.3 Type 1A eggbeater drill
On the back side, the innovation becomes quite clear - There is a toothless idler "gear."  And by now it's obvious that there's no place to put the bits except in the chuck, which is why this drill is the first known example.Back side of T Ralph Stumpe's solid-handled Type 1A No.3 Millers Falls drill
Sounds like a great idea, but the spindle & idler rotate oppositely, increasing drag and encouraging the idler to slip over the main gear's teeth, quickly wearing them and the idler. A better view of the main handle and idler are below, along with the Type 1 (washer plus pin fastening method) crank handle:
Solid main handle and smooth idler
Type 1 crank handle