No. L111082 on circular platform with knob: ' CLAMP FREE '. Scale 0 - 8 - 0 in divisions of 0.2. With bridge resistor logo. 3 terminals, one for ac. ' 220 - 250 V / 50 ~ '
Scale : 0 - 100 in divisions of 1 microamp. Brown sides, black top; 2 terminals on left. Circular platform on top ' UNIPIVOT / ZERO ADJUSTMENT / DEPRESS & TURN / TO CLAMP '
the apparatus rotates a drum that has a window slot containing a glass insert, possibly for gauging rotational speed of a shaft viewed through the window or light projected through the window; hand or belt driven