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Mechanical Equinoctial Dial, by J. D. Beÿser, German, 18th Century

preview image for Mechanical Equinoctial Dial, by J. D. Beÿser, German, 18th Century
Inventory Number: 41087
Object Type:
Persons: J. D. Beyser (Maker (Signed by))
Date Created: 18th century
Place Created: Germany Europe
Subject Classification(s): Lewis Evans Collection By Collection Sundials Mathematical Instruments By Trade Location  
Accession Number: 1924-0/part
Brief Description: Octagonal base with inset compass bowl (with variation indicator); sprung folding plumb level; four levelling feet; latitude scale (20-70°) with index controlling elevation of sprung hinged hour dial by a vertical cam; hour dial has a compass rose scale and an alidade carrying a minute dial with a central socket for a wind vane. The underside of the compass bowl has a simple volvelle relating days of the week to the date in the month. With red morocco-covered, blue silk-lined pasteboard case with lunar volvelle and aspectarium in the lid. Manuscript instruction sheet is now MS Museum 164.
Primary Inscriptions: "J. D. Beÿser"
Provenance: From the collection of Lewis Evans.
Collection Group: Lewis Evans Collection
Material(s): Gilt and silvered brass
Height Width Depth Diameter Unit
91 91 mm


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