Part of a portable sundial-calendar, Byzantine, c 520 AD.
4 0 c m
 
31cm
actual image size: 23cm x 32cm

Part of a portable sundial-calendar, Byzantine, c 520 AD.

© Science Museum / Science & Society Picture Library

Description

Detail of the gearing. These four fragments are the remains of a portable sundial with calendrical gearing. The gear wheels are the second oldest surviving examples. They provide important evidence linking the earliest known geared mechanism, a Hellenistic calendrical instrument (dated to the 1st century BC), with the earliest gearing from the Islamic world (dated to c 1000 AD), thereby indicating the path of transmision of such technology.
 

Image Ref.

10240428
 

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