Rare MITAC Polished Aluminum Classroom Gyroscope

Manually manipulated blue and silver anodized aluminum gyroscope composed of two gimbal rings, a central rotor, spine axle, frame and base (ca. late 1940s/early 1950s, USA). The rotor in this case is a cube representing azimuth - the angle between North, measured clockwise around the observer's horizon, and a celestial body (sun, moon). Hence, the presence of both "N" and "E" compass directions on the rotor. The gimbals denote "elevation" and "roll." Interesting piece which serves as both scientific tool and modernist decorative object...

This set took me over 20 years to procure.....Dont miss this opportunity!!!!Being offered extremely rare collection of aluminum string instruments,,string bass, ,cello,,and violin....... circa 1930s, all 3 instruments originaly wood grain painted, have been stripped and polished.. re-strung and set up, new bridge and custom (alcoa) tail piece, original ebony fret board, All play and Sound amazing. If purchasing to play, wonderful decorative sculpture, Pfretzschner aluminum bass In 1928, The Aluminum Company of America manufactured 50 aluminum double basses...