universal equatorial sundial
Datedate 1793
Inventory Number7114
ClassificationSundial
Subject
Maker
Thér Barrelet
Cultural Region
Place of Origin
Dimensionsopen - as photographed: 11.4 × 12.4 × 11.6 cm (4 1/2 × 4 7/8 × 4 9/16 in.)
closed: 4.2 × 12.4 × 11.6 cm (1 5/8 × 4 7/8 × 4 9/16 in.)
closed: 4.2 × 12.4 × 11.6 cm (1 5/8 × 4 7/8 × 4 9/16 in.)
Material
AccessoriesNone. Plumb bob is missing.
DescriptionEquinoctial dial with an open, partially circular chapter ring marked V-XII, I-VII, subdivided in 1/4 hour increments. The vertical angle of the chapter ring is adjustable for northern latitudes from 0° to 70°, calibrated in 1° increments. A peep hole for a light spot is attached to a square plate which slides in a rectangular frame with rullings on both,Annalematic scale on plate holding peep hole is calibrated to allow adjustment for the sun's declination.,rectangular with a semicircular side
SignedSigned "Exécuté par Thér Barrelet 1793" engraved on top surface of base plate.
Curatorial RemarksAppraisal by Brieux, 9/24/84: $1000. Maker not listed in Augarde or Daumas
FunctionTime-finding by orienting the peep hole so as to cause a spot of light to fall on the line in the center of the chapter ring. The peep hole must first be adjusted for the sun's declination but no compass is required for orientation. The function of this dial is identical to that of a universal equinoctial ring dial.
ProvenanceDavid Wheatland purchased from Lorenzo Paolozzi, Rome, Italy, August 1954 (#1). Donated to CHSI 1985.
G. Winckler
Date: 1790
Accessories: Leather covered rectangular case and 4 leveling screws. Paper with calculations in pencil and printed "KUNSTAUKTIONSHAUS Math. Lempertz ...Koln " loose in case.
Object number: 7106
Jacobus Lusberg
Date: date 1688
Accessories: Oval green sharkskin fitted case and seperate plummet.
Object number: 7068
George Dollond (I)
Date: circa 1830
Accessories: Mahogany box with fitted interior and two exterior brass hooks and two brass hinges.
Object number: 7056
German
Date: 1700
Accessories: None. A painted metal stand, No. 408 is associated with this dial but has not been located
Object number: 7172
Francois Laurier
Date: 1654-1663
Accessories: Original black leather covered, chamois lined fitted case.
Object number: 7415