Astrolabe Catalogue

 

Front of astrolabe without rete or plates. Click to enlarge
Date ca. 1710
Maker Muḥammad Ṭāhir
Place Iṣfahān
Material Brass
Inventory no. 46836
Acquisition Presented by Lewis Evans in 1924

Throne

The throne is of the indo-persian, engraved type . The throne is attached with a integrated base. Both front and back are decorated with foliate patterns.

Ring

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

Shackle

Shackle of the omega type (i.e. Ω-shaped shackle). The omega-shaped shackle is quite elongated, almost to the point of being a tear-drop shape.

Mater

The mater and limb are of one-piece construction. The tab that holds the plates in place is located at the bottom of the instrument, i.e., 180° from the throne. Scales on the limb:
Type Range & Units Numbered Geometry Location
Degree 0 - 360 Degrees Every 5 degrees Circular, concentric outer

Womb


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