Millers Falls No.1, 3 & 5 eggbeater drills
Type Study
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Millers Falls No.1 eggbeater drill;
Type 2.

The improvements have started. They're hard to see here, but the main gear's teeth have been cut from the solid, making this the first smooth-running type.

Millers Falls No.1 drill, Type 2
The hollow handle isn't lined any more:
Unlined hollow handle

The crank pin design has also changed; there is still a pin (thicker now) but it's pressed into the boss cast into the main gear.  The main gear has had its teeth cut from the solid rather than cast to shape as in the earlier types; on closer inspection, the teeth have sharp corners along their edges. And the gear now has a decorative bead cast into the rim.  Consequently, the gears mesh much more smoothly.