Date | ca. 1650 |
Maker | Muḥammad Mahdī |
Place | Persia |
Material | Brass |
Inventory no. | 41763 |
Acquisition | Presented by J. A. Billmeir in 1957 |
Alidade
Appearance | Tip | Sights | Pinholes | Notches | Description |
---|---|---|---|---|---|
Double-ended, original. | Simple | Rigid | Double | None |
Scales
Type | Range & Units | Numbered | Geometry | Location |
---|---|---|---|---|
Sine/Cosine | 0 - 60 1/60 of quadrant radius | Every 5 | Linear | Rule, right arm |
Unequal hours | 1 - 12 1/12 of daylight | Every 1 hours | Linear | Rule, right arm |