Propeller. Interesting, 3-blade, adjustable air propeller. The clockwork can be operated, and the adjustment of the blades is actuated by the rod above the propeller-shaft.

Digital Commonwealth — Boston Public Library

Propeller. Interesting, 3-blade, adjustable air propeller. The clockwork can be operated, and the adjustment of the blades is actuated by the rod above the propeller-shaft.

[ca. January 1939]

RightsCC0 — Public Domain

CollectionDigital Commonwealth — Boston Public Library

[Information from item housing] Gadgets

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