Cotangent
| Type: | Cotangent |
| Style: | Cotangent, arc |
| Geometry: | Circular, concentric |
| Unit of measurement: | Fingers |
| (Numbering) starts at: | 15 |
| (Numbering) ends at: | 30 |
| Numbered: | every 3 |
| Repeats: | 4 times |
| Divided every: | 3 (Fingers) |
| then every: | 1 (Fingers) |
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) |
Inscription(s):
| Type: | Scale label |
| Content: | صلة لاصابع الظلين |
| Translation: | Relationship for the fingers of the two shadows |
| Language: | Arabic |
| Script: | Kufic |
| Notes: | |
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