Stage rotation. Here the stage was rotated from position "A" to position "B.

Rack and pinion mechanism for the mechanical stage (bottom view). Thumbwheels (seen in figure above) control X and Y movement of the rectangular specimen plate.

The stage sits in this circular brass mount. Thumbscrew (arrow) fixes the stage rotational position.

Mechanical stage controls: Top wheel is "Y" and the bottom wheel is "X" movement.