Rule, Regula, Pointer and Alidade Images
Alidade Image:
| Date | 20th century |
| Place | Persia (?) |
| Material | Brass |
| Inventory no. | 54545 |
| Acquisition | Presented by J. A. Billmeir in 1957 |
Alidade
| Appearance | Tip | Sights | Pinholes | Notches | Description |
|---|---|---|---|---|---|
| Double-ended, original. | Simple | Rigid | Single | None | This rule contains a number of scales, though they are rarely intelligible.. |