| Date |
1708/9 |
| Maker |
Khalīl Muḥammad ibn Ḥasan
‘Alī |
| Place |
Iṣfahān |
| Material |
Brass |
| Inventory no. |
46680 |
| Acquisition |
Presented by J. A. Billmeir in
1957 |
Rule, Regula, Pointer and Alidade Images
Alidade Image:
Alidade
| Appearance |
Tip |
Sights |
Pinholes |
Notches |
Description |
| Double-ended, original. |
Simple |
Rigid |
Double |
None |
|
Scales
| 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 |
