Cotangent
| Type: | Cotangent |
| Style: | Cotangent, arc |
| Geometry: | Circular, concentric |
| Unit of measurement: | Fingers |
| Numbered: | The numbers are too worn to read |
| Repeats: | 2 times |
Scale located on: Tympan, Womb or Back .
Location(s) detail:
| 3: | Lower left quadrant of outer circular on back of instrument. (3) |
| 4: | Lower right quadrant of outer circular on back of instrument. (4) |