Date |
1327/28 (A.H. 724) |
Maker |
‘Alī ibn Ibrāhīm
al-Jazzār |
Place |
Taza |
Material |
Brass |
Inventory no. |
50853 |
Acquisition |
Purchased from Ernst Weil in
1957 |
Rule, Regula, Pointer and Alidade Images
Alidade
Appearance |
Tip |
Sights |
Pinholes |
Notches |
Description |
Double-ended, original. |
Decorative |
Rigid |
Single |
None |
The rule
has an usual triangular cross-section. |
Scales
Range & Units |
Numbered |
Geometry |
Location |
Sine/Cosine |
0 - 60 1/60 of quadrant radius |
Every 5 |
Linear |
Rule, left arm |
Sine/Cosine |
0 - 60 1/60 of quadrant radius |
Every 5 |
Linear |
Rule, right arm |