This vintage kitchen gadget is a hand-crank rotary egg beater, also known as a manual mixer.
The beaters were placed inside a bowl while the side handle was turned. The exposed gears transferred that motion to the two metal beaters, allowing them to spin quickly.
It was commonly used for beating eggs, whipping cream, mixing batters, and preparing other light mixtures before electric hand mixers became widespread.
The correct answer is a hand-crank egg beater.


