Astrolabe Catalogue

Inventory no.47367
AcquisitionPresented by Lewis Evans in 1924

View all images for this astrolabe
View detailed provenance for this astrolabe

Throne, Ring and Shackle

The throne is of the simple, engraved type made of brass attached with integrated base made of brass and eye-bolt type shackle made of brass . More information


The mater and limb are of one-piece construction. The bottom of the limb has been cast to form a type of base or foot for the instrument. This has been decoratively engraved with a foliate pattern. Scales on the limb: unequal hours scale; degree scale. More information


There is a volvelle on the back of this instrument. It bears at least two scales, numbered 2 to 22; 0 to 12; o to 21; and 0 to 11. The volvelle is shaped like a disc with the head and tail of a dragon, suggesting that this might be a set of scales used to calculate lunar nodes or eclipses. The back contains 4 scales of the following types: Degree; Zodiacal signs; Calendar; Other. More information

Rete, Pin & Wedge

The rete contains 9 stars. The zodiac on the rete is labelled: ARIES , TAVRVS , GEMINI , CANCER , LEO , VIRGO , LIBRA , SCORPIVS , SAGITARIVS , CAPRICORNVS , AQVARIVS , PISCES .
The rete is attached using a pin & wedge. The pin is attached to the regula. The original wedge has been lost, replaced by a small brass brad. More information


There is one plate for latitude 45°0' . More information

Rules & Alidades

Type Details
RegulaDouble-ended, counter-changed. This rule resembles those used with universal projections and was probably intended to serve the universal plate. However, the cursor is now missing.
AlidadeDouble-ended, counter-changed. One of the two sighting vanes has only one pinhole.
More information


MHS Home | Contact Us | ©2006 Museum of the History of Science