Model of a Double-Threaded Archimedean Screw Propeller, Rijk (attributed to), D. van den Bosch (attributed to), 1844 instruction model Polychromed instruction model of a biling -ranged Archimedic screw in a frame on a ground board. The corridors go around twice and are divided into blue and white painted segments, from which a normal two -leaf screw can be constructed. The screw can be turned by hand on the propeller shaft. The emergency is approx. 11 cm, the diameter 8 cm. Scale 1:20 (derived). Netherlands wood (plant material). brass (alloy)

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Size: 6666px × 4710px
Photo credit: © piemags/rmn / Alamy / Afripics
License: Licensed
Model Released: No

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