Rule, Regula, Pointer and Alidade Images
Alidade Image:
| Date | early 18th century |
| Maker | ’Abd al-’Alī |
| Place | Persia |
| Material | Brass |
| Inventory no. | 37940 |
| Acquisition | Presented by J. A. Billmeir in 1957 |
Alidade
| Appearance | Tip | Sights | Pinholes | Notches | Description |
|---|---|---|---|---|---|
| Double-ended, original. | Simple | Rigid | Single | None | This rule is extensively engraved with abdjad numerals, intended to resemble scales. They do not, however, correspond to any recognizable scale.. |