ring sundial
Date1700
Inventory Number7132
ClassificationSundial
Subject
Maker
I Z
Seller
Ernst Weil
1891 - 1965
Collector
David P. Wheatland
1898 - 1993
Place of Origin
DimensionsOverall: 0.1 lb., 4 x 1 x 4 x 5.8 cm (0.1 kg, 1 9/16 x 3/8 x 1 9/16 x 2 5/16 in.)
Overall - Storage: 1 x 4 x 5.8 cm (3/8 x 1 9/16 x 2 5/16 in.)
Overall - Storage: 1 x 4 x 5.8 cm (3/8 x 1 9/16 x 2 5/16 in.)
Material
AccessoriesNone
Description1 1/2" Diameter Brass Ring Dial (Poke) with non-circular time scale by IZ
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 four divisions per month 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 cylindrical section of brass 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 48.4° (Augsburg). There is a suspension loop that appears to be continuous. The vernal equinox is set for approximately March 21.,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 four divisions per month 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 cylindrical section of brass 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 48.4° (Augsburg). There is a suspension loop that appears to be continuous. The vernal equinox is set for approximately March 21.,circular
SignedSigned with mark of a cross and "IZ" on end of interior bracket
Curatorial RemarksAppraised by Brieux, 9/24/84: $200 ATAN(17.7/15.7)=48.4°
FunctionTime-finding by measurement of the sun's altitude, corrected for declination.
ProvenanceDavid Wheatland purchased from Ernst Weil, London, March 16, 1959 (catalog 27, #321). Donated to CHSI, 1985.
Johann Nepomuk Schrettegger
Date: circa 1800
Accessories: case
Object number: 7090
Charles Bloud
Date: 1653
Accessories: Stored in briefcase (not with sundial in its present location).
Object number: 7800