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 |