Hand-Rolled Egg Beater: Rub Two Rolls Between the Palms

"In the operation of this improved implement, it will be evident that if it be held by its cylinders B B' between one's hands, and an alternately backward and forward motion given to the latter, corresponding rotary motions will be given to the said cylinders, and alternating rotary motions in opposite directions to each other will be given to the agitators C and D."

Print two rolls and two 10-tooth pinions of module 1.5. Print in PETG at 0.2 mm layers, 30 % infill, 4 walls.

Cut 160 mm of 25 × 3 mm flat bar, narrow it to 10 mm, and bend both ends at right angles to make a frame 122 mm between ends. Drill each end twice, 15 mm apart, for the rolls' axles.

Run a 3 mm wire axle through each roll and the frame. Fix the first roll's axle on through the frame as the inner agitator's stem; slide a tube over it for the outer agitator with a pinion on top, meshing the pinion on the second roll's axle. Bend stainless loops onto each: inner 18 mm, outer 32 mm across.

US 36,030 drawing sheet, public domain (expired patent).

Hold the rolls between the palms over a bowl of two egg whites and rub back and forth; time to stiff peaks.

**David Shive** of Philadelphia received US 36,030, dated 29 July 1862. His frame is a flattened strip of metal bent at right angles at each end; the rolls are hard wood, about three-eighths of an inch across and four inches long. Roll B, stem E and frame may be fixed together so only the outer agitator turns, but he found both turning more effective, at no extra cost. He named mixing beverages in hotels as well as family use. **Honest limits.** FDM prints hold food in their layer lines, so wash well and replace when worn. Printed rolls and module-1.5 pinions stand in for his wood and metal. Your times are the result.