| 摘要 |
The apparatus comprises two identical carriages mounted in opposite relation and driven in horizontal translational motion on a stationary frame, a stirrup mounted on each carriage for supporting an emitting and receiving optical system which defines a substantially vertical light ray having high definition, an optical gage and stops which are supported together with the cylindrical object to be measured on a fixed stage which is located substantially in the central horizontal plane of the stirrups, the stage being provided with a vertical slot for the passage of the light rays which are produced by the optical system. |
