Cotangent
| Type: | Cotangent |
| Style: | Cotangent, arc |
| Geometry: | Circular, concentric |
| (Numbering) starts at: | 0 |
| (Numbering) ends at: | 30 |
| Numbered: | every 5 |
| Divided every: | 5 (None) |
| then every: | 1 (None) |
Scale located on: Tympan, Womb or Back .
Location(s) detail:
| 3: | Lower left quadrant of outer circular on back of instrument. (3) |