Astrolabe Catalogue

 

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:

astrolabe part (photo)

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


Type 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
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