Other
| Type: | Other |
| Geometry: | Circular, concentric |
| (Numbering) starts at: | 1 |
| (Numbering) ends at: | 90 |
| Numbered: | every 1 |
| Repeats: | 1 times |
| Divided every: | 1 (None) |
| Notes: | There are two sets of numbers on this scale: 1 to 90 and against them 17 to 1000. The purpose of this scale eludes explanation at the moment. This scale is to be used with the volvelle on the back of the instrument. The volvelle has a small notch cut out, through which the numbers on this scale can be read |
Scale located on: Tympan, Womb or Back .
Location(s) detail:
| 7: | Circular scale third in from the outer scale - refers to the full circle. (7) |