Inside Out Library · ExploreAir Wonder Stories, Vol. 1, No. 3 (September 1929) (1929)leaf 6(Gyroscope — Courtesy Sperry Gyroscope Company) LIGHTInternet Archive · Public domain (published before 1931). Free to use for anything.More pictures from Air Wonder Stories, Vol. 1, No. 3 (September 1929)More like this
