| Date |
1559 |
| Maker |
Thomas Gemini |
| Place |
London |
| Material |
Brass |
| Inventory no. |
42223 |
| Acquisition |
Transferred from the
University Observatory, Oxford, in 1936 |
Rule, Regula, Pointer and Alidade Images
Alidade Image:
Rule Image:
Alidade
| Appearance |
Tip |
Sights |
Pinholes |
Notches |
Description |
| Double-ended, counter-changed,
original. |
Notched |
Rigid |
Double |
None |
|
Scales
| Range & Units |
Numbered |
Geometry |
Location |
| Declination |
0 - 72 Degrees |
Every 10 degrees |
Linear |
Rule, right arm |
Alidade
| Appearance |
Tip |
Sights |
Pinholes |
Notches |
Description |
| Single-ended, original. |
Flat |
None |
None |
None |
Rule
for use with the universal planisphere. Slotted for a
cursor and bracchiolus, which are missing. |
