rotascope

n.

陀螺仪；回旋装置；回转仪；纵舵调整器

The rotascope
The rotascope
Description of an appratus, called to rotascope, for exhibiting several phenomena, and illustrating certain laws of rotary motion
Rotascope Makes Objects Appear to Stand Still
Method and apparatus for producing optical effects
On the Late Development and Possible Astronomical Origin of the Gyroscope
On the Late Invention of the Gyroscope
Gyro-Compass
Gyro-Compass
Deviated distal viewing endoscope