Date |
1565 |
Maker |
Regnerus Arsenius |
Place |
Louvain |
Material |
Gilt brass |
Inventory no. |
53558 |
Acquisition |
Lewis Evans
Collection |
Rule, Regula, Pointer and Alidade Images
Alidade Image:
Alidade
Appearance |
Tip |
Sights |
Pinholes |
Notches |
Description |
Double-ended, counter-changed,
original. |
Simple |
Rigid |
Single |
None |
The two sighting vanes are later additions. They are
attached with screws and cover up some of the engraving
on the alidade.
The original sights would have been wider than the arms
of the alidade in order to align the pinholes. |
Scales
Range & Units |
Numbered |
Geometry |
Location |
Declination |
0 - 70 Degrees |
Every 10 degrees |
Linear |
Rule, left arm |
Declination |
0 - 23.5 Degrees |
Every 10 and 23 1/2 degrees |
Linear |
Rule, left arm |
Equal
hours |
2 - 12 Times of day |
Every 1 hours |
Linear |
Rule, right arm |
Equal
hours |
0 - 10 Times of day |
Every 1 hours |
Linear |
Rule, right arm |