'Unaffected by magnetic fields, Elmer Sperry's gyroscopic type of this device even worked at the North Pole'
compass
INNOVATORS: Unaffected by magnetic fields, Elmer Sperrys gyroscopic type of this device even worked at the North Pole
Unaffected by magnetic fields, Elmer Sperry's gyroscopic type of this device even worked at the North Pole
Unaffected by magnetic fields, Elmer Sperry's gyroscopic type of this device even worked at the North Pole
INNOVATORS
compass
INNOVATORS