Shadow square
| Type: | Shadow square |
| Style: | Tangent/Cotangent |
| Geometry: | Box |
| Unit of measurement: | Fingers |
| (Numbering) starts at: | 0 |
| (Numbering) ends at: | 12 |
| Numbered: | Not numbered |
| Repeats: | 4 times |
| Divided every: | 2 (Fingers) |
| then every: | 1 (Fingers) |
| Notes: | This shadow square is incomplete and unusual in that it is in the upper two quadrants of the back of the instrument. Further, the numbers normally engraved on a shadow square are scratched into the lower quadrants, where the shadow square is typically found |
Scale located on: Tympan, Womb or Back .
Location(s) detail:
| Upper half: | The upper two quadrants of the back of the instrument (Upper half) |