Vintage Marine Engine Valve & Propeller Motion Demonstrator by Clarence E. Long bike path this appears to be a

this appears to be a simple framed print

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Vintage cast iron laundry wringer

AB - 103868 - 072921

Vintage Marine Engine Valve & Propeller Motion Demonstrator by Clarence E. Long bike path this appears to be ac. 1930s; Clarence E. Long Marine Engineering School Milwaukee, Wisconsin Mechanical marine engineering demonstrator constructed as an instructional display to illustrate the relationship between propeller rotation and internal valve or linkage motion. Mounted on a painted wooden backboard with integrated base and carry handle, the piece features a brass and steel linkage assembly connected to a small metal propeller. Turning the propeller drives the