Astrolabe Catalogue

 

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


Type 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
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