Rule, Regula, Pointer and Alidade Images
Alidade Image:
| Date | 18th century |
| Place | India |
| Material | Brass |
| Inventory no. | 52478 |
| Acquisition | Presented by J. A. Billmeir in 1957 |
Alidade
| Appearance | Tip | Sights | Pinholes | Notches | Description |
|---|---|---|---|---|---|
| Double-ended, original. | Simple | Rigid | Single | None | A remarkable feature of this alidade is the sighting tube attached to the two sights. It has a large diameter and might have been used for sighting at night.. |