| Date |
1350/1 (A.H. 751) |
| Place |
Persia (?) |
| Material |
Silver |
| Inventory no. |
41106 |
| Acquisition |
Purchased from Malcolm Gardner
in 1955 |
Rule, Regula, Pointer and Alidade Images
Alidade Image:
Alidade Image:
Alidade
| Appearance |
Tip |
Sights |
Pinholes |
Notches |
Description |
| Double-ended, original. |
Simple |
Rigid |
Single |
None |
The scales on the alidade
are irregularly graduated and poorly engraved to the
point of being useless. |
Scales
| Range & Units |
Numbered |
Geometry |
Location |
| Sine/Cosine |
0 - 60 1/60 of quadrant radius |
Every 6 |
Linear |
Rule, right arm |
