ring sundial
Date1700
Inventory Number7124
ClassificationSundial
Subject
Maker
English
?
Maker
German
?
Place of Origin
DimensionsOverall: 0.1 lb., 3.9 x 0.7 x 3.9 x 4.6 cm (1 9/16 x 1/4 x 1 9/16 x 1 13/16 in.)
Overall - Storage: 0.7 x 3.9 x 4.6 cm (1/4 x 1 9/16 x 1 13/16 in.)
Overall - Storage: 0.7 x 3.9 x 4.6 cm (1/4 x 1 9/16 x 1 13/16 in.)
Material
AccessoriesNone
Description1 1/2" Diameter Brass Ring Dial (Poke) with non-circular time scale
1 1/2" diameter brass Ring Dial with an additional curved section fastened inside and forming a portion of the time scale. A declination scale is divided into months on the exterior surface and a time scale in Arabic numerals subdivided into 1/2 hour increments on the interior surface of the ring. The ring is made from a flat strip of brass rivited to form a circle and a second strip of brass is rivited interior to the ring to compensate for higher sun elevations. The dial is designed for a latitude of approximately 50.5° (London?). The vernal equinox is set for approximately 10 March.,circular
1 1/2" diameter brass Ring Dial with an additional curved section fastened inside and forming a portion of the time scale. A declination scale is divided into months on the exterior surface and a time scale in Arabic numerals subdivided into 1/2 hour increments on the interior surface of the ring. The ring is made from a flat strip of brass rivited to form a circle and a second strip of brass is rivited interior to the ring to compensate for higher sun elevations. The dial is designed for a latitude of approximately 50.5° (London?). The vernal equinox is set for approximately 10 March.,circular
Curatorial RemarksATAN(21/17.3)=50.5° latitude
FunctionTime-finding by measurement of the sun's altitude, corrected for declination.
ProvenanceJoseph Drecker, Aachen, Germany, before 1928 (no. 89); Frederik Casparus Wieder, Noordwijk, The Netherlands, 1928; D. P. Wheatland, Topsfield, MA, 1959; gift to CHSI, ca. 1987.
Charles Bloud
Date: 1653
Accessories: Stored in briefcase (not with sundial in its present location).
Object number: 7800