| Date |
984/5 or 1003/4 (A.H. 374 or
394) |
| Maker |
Aḥmad and Muḥammad |
| Place |
Iṣfahān |
| Material |
Brass |
| Inventory no. |
33767 |
| Acquisition |
Presented by Lewis Evans in
1924 |
Rule, Regula, Pointer and Alidade Images
Alidade Image:
Alidade
| Appearance |
Tip |
Sights |
Pinholes |
Notches |
Description |
| Double-ended, original. |
Decorative |
Rigid |
Single |
None |
|
Scales
| Range & Units |
Numbered |
Geometry |
Location |
| Unequal
hours |
1 - 12 1/12 of daylight |
Every 1 hours |
Linear |
Rule, right arm |
| Sine/Cosine |
1 - 60 1/60 of quadrant radius |
Every 5 |
Linear |
Rule, left arm |
| Sine/Cosine |
1 - 60 1/60 of quadrant radius |
Every 5 |
Linear |
Rule, right arm |
