London, South Kensington
8 April 2009
An Indian astrolabe inscribed in Persian
unsigned and undated, the throne decorated in relief with the reverse blank, the degree scale around the limb 0°-360° divided by 1° marked twice, once in numerals by 10° and once in abjad, no plates present, the inside of the mater engraved with projection for an aproximate latitude of the Tropic of Cancer; the reverse with shadow square to lower quadranrs, a sexagesimal trigonometric grid with non-horizontal dividing lines to the upper left quadrant, arc of signs equally spaced to upper right quadrant; the rete for 26 stars, not all named, crude alidade with sight vanes and curved cross-bar, horse missing, small pin present.
7½in. (19cm.) radius
The similarity to No.136 in the Khalili collection suggests this was cast from the same workshop.
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Maddison, F. & Savage-Smith, E. Science, Tools & Magic Part One. Body and Spirit, Mapping the Universe The Nasser D. Khalili Collection of Islamic Art Vol.12. (Oxford: 1997), pp.237-8.
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