File:Britannica Astrolabe - Persian Astrolabe c.1712.jpg
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Original file (2,926 × 2,137 pixels, file size: 575 KB, MIME type: image/jpeg)
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| Description | Drawing of a Persian astrolabe of c. 1712 | |||
| Date | published 1911 | |||
| Source | Encyclopædia Britannica (11th ed.), v. 2, plate facing p. 794. | |||
| Author | Unknown author | |||
| Permission (Reusing this file) |
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Caption:
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Front, showing the Rete or Spider, a network of star pointers. Beneath the Rete, in a hollow, are four thin brass discs, called Tables or Climates, engraved with projections of the sphere for different latitudes. |
Back, showing graduations, parallelogram for measuring heights, and other tables, together with the Rule with sights (A) held by a moveable pin (B), known as the Horse or Wedge. |
File history
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 17:43, 20 June 2012 | | 2,926 × 2,137 (575 KB) | Bob Burkhardt | {{Information |Description=Drawing of a Persian astrolabe of c. 1712 |Source=''Encyclopædia Britannica'' (11th ed.), v. 2, plate facing p. 794. |Date=published 1911 |Author=unknown artist |Permission={{PD-Britannica}} |other_versions= }} Caption: {| |... |
File usage
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