History of Science Museum: Collection Database Search

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Inventory no. 52020 - Former Display Label

QUADRANT of unknown origin
c.1300

Brass. Unsigned and undated.

This is an example of a quadrans vetus.

The hour-lines indicate planetary (i.e. unequal hours).

The sliding plate at the bottom (the 'cursor') enables the instrument to be used in any latitude. The cursor is engraved with calendar and zodiac scales. The cursor is moved along the scale, on the bottom edge of the quadrant, until its mid-point lies against the colatitude of the place where the instrument is to be used.

On the back of the instrument are circular calendar and zodiac scales of the type found on the back of many astrolabes. The index arm and some form of revolving scale are missing.

[F. 10]
Lewis Evans Collection

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