Rule, Regula, Pointer and Alidade Images
Alidade Image:
| Date | 1682 (A.H. 1093) |
| Maker | Qāsim ‘Alī Qā’inī |
| Place | Persia |
| Material | Brass |
| Inventory no. | 45509 |
| Acquisition | Presented by J. A. Billmeir in 1957 |
Alidade
| Appearance | Tip | Sights | Pinholes | Notches | Description |
|---|---|---|---|---|---|
| Double-ended, original. | Gothic, simple | Rigid | Single | None | This alidade was repaired at the right sighting vane. |
Scales
| Type | Range & Units | Numbered | Geometry | Location |
|---|---|---|---|---|
| Sine/Cosine | 0 - 60 | Every 5 | Linear | Rule, right arm |