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Astrolabe with Geared Calendar, by Muhammad b. Abi Bakr, Isfahan, 1221/2

Inventory Number: 48213
Object Type: astrolabe
Persons: Muhammad b. AbiBakr
Date Created: 618 A.H (1221/2 A.D.)
Place Created: Isfahan Iran/Persia Asia
Subject Classification(s): Astronomy By Discipline Astrolabes Astronomical Instruments Mathematical Instruments By Trade Location  
Accession Number: 1924-0/part
Brief Description: Astrolabe with rete incorporating sights, 2 latitude plates, mater with pierced throne. The back has a calendar with three apertures, one showing the lunar phase, one the numerical age of the moon, one the positions of the sun and moon in the zodiac. The calendar, worked by the motion of the rete, is moved by a gear train within the mater, comprising 5 cog wheels, 2 of which are double. Pin and horse. The soldering of the central gear wheel to the pin has failed.
Primary Inscriptions: "Made by Muhammad b. Abi Bakr b. Muhammad al-Rashidi al-Ibari [or al-Abiri] al-Isfahani". "618 [A.H. = 1221-2 A.D.]" On one of the wheels is engraved, 'Its owner is the poor man Hasan Shâh'.
Provenance: Presented by Lewis Evans.
Collection Group: Lewis Evans Collection
Material(s): Brass with silver ornament
Dimensions:
Height Width Depth Diameter Unit
275 185 50 mm

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