Astrolabe Catalogue


Front of astrolabe without rete or plates. Click to enlarge
Date 1221/2 (A.H. 618)
Maker Muḥammad ibn Abī Bakr
Place Iṣfahān
Material Brass
Inventory no. 48213
Acquisition Presented by Lewis Evans in 1924


The throne is of the indo-persian, pierced type . The throne is attached with a integrated base.


The ring is of the simple, squared cross-section type (i.e. a simple ring made from a round rod or piece of metal).


Shackle of the omega type (i.e. Ω-shaped shackle). Inverted teardrop shaped tabs..


The mater and limb are of one-piece construction. The edge of the limb is decorated with pictorial representations of the zodiac alternating with images of warriors.. Scales on the limb:
Type Range & Units Numbered Geometry Location
Degree 0 - 360 Degrees of arc Every 5 degrees Circular, concentric None


The womb is blank except for a fragment of an inscription. There is a pin at the bottom of the womb that holds the tympans in place. The plate of the womb is located towards the front of the instrument to allow room for the gears that are attached to the back plate..
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