Rule, Regula, Pointer and Alidade Images
Alidade Image:
| Date | ca. 1660 |
| Maker | Muḥammad Mahdī |
| Place | Persia |
| Material | Brass |
| Inventory no. | 45581 |
| Acquisition | Presented by J. A. Billmeir in 1957 |
Alidade
| Appearance | Tip | Sights | Pinholes | Notches | Description |
|---|---|---|---|---|---|
| Double-ended, replacement. | Simple | Rigid | Single | None | The lack of decorative elements on the rule as well as the absence of scales suggest that this is a later replacement. |