Rule, Regula, Pointer and Alidade Images
Alidade Image:
| Date | ca. 1400 |
| Maker | Jean Fusoris |
| Place | Paris |
| Material | Brass |
| Inventory no. | 53801 |
| Acquisition | Presented by J. A. Billmeir in 1957 |
Alidade
| Appearance | Tip | Sights | Pinholes | Notches | Description |
|---|---|---|---|---|---|
| Double-ended, counter-changed, original. | Gothic, inverted | Rigid | Single | None |
Scales
| Type | Range & Units | Numbered | Geometry | Location |
|---|---|---|---|---|
| Unequal hours | 2 - 11 1/12 of daylight | Every 1 hours | Linear | Rule, left arm |