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Production. Airplane propellers. Frank Geary uses an electro-limit gauge at a Hartford, Connecticut, plant to make final…
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Production. Airplane propellers. Frank Geary uses an electro-limit gauge at a Hartford, Connecticut, plant to make final inspections of a three-way hydromatic spider that form part of the mechanism which varies the pitch of airplane propeller blades while planes are in action. At this plant propellers are made with combinations of two, three and four blades. Sourced from the Library of Congress.

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Production. Airplane propellers. Frank Geary uses an electro-limit gauge at a Hartford, Connecticut, plant to make final inspections of a three-way hydromatic spider that form part of the mechanism which varies the pitch of airplane propeller blades while planes are in action. At this plant propellers are made with combinations of two, three and four blades. Sourced from the Library of Congress.

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