Model of a Two-Blade Parabolic Propeller, anonymous, c. 1850 Canvas Print
Model of a two-bladed parabolic screw in a frame on a base board. The printing surface of the screw blades is curved in the form of a parabola. The screw probably does not belong in this frame, where a much larger screw can go in. The model has a diameter of 85 mm, the hub has a diameter of 8 mm and is probably too long in relation to the actual size, to fit into the frame. Scale 1:20 (derived).
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