5
5

PROPERTY OF A WASHINGTON STATE COLLECTOR

a rare silvered brass self-orienting horizontal dial, Germany, circa 1800
Estimate
3,0005,000
LOT SOLD. 1,440 USD
JUMP TO LOT
5

PROPERTY OF A WASHINGTON STATE COLLECTOR

a rare silvered brass self-orienting horizontal dial, Germany, circa 1800
Estimate
3,0005,000
LOT SOLD. 1,440 USD
JUMP TO LOT

Details & Cataloguing

a rare silvered brass self-orienting horizontal dial, Germany, circa 1800
the heart-shaped horizontal dial with scale divided 7-12-5 reading for half, quarter hours to five minutes through a gut line gnomon set for six o'clock on a vertical support, replaced, and tensioned by a cylindrical plumb bob, the cylindrical body with triangular case set on the noon position engraved on both faces with scales for calendar months, irregular dates with non-corresponding divisions for calendar months, irregular dates differing in each month, above a circular plate slotted into the cylindrical body at the equinox, engraved in its upper quadrant with a table equation of time, mounted on an inclining pillar set for latitudes, against a scale 0 to 60 degrees at right angle to the latitude scale arm and fixed to an oval base plate set at 45 degrees, supported on original separate circular stand with three leveling screws and central inset circular bubble level
Height 24cm (9 1/2in)
Read Condition Report Read Condition Report

Provenance

Sotheby's, London,  September 29th, 1995, lot 632

Catalogue Note

A well-made, highly unusual instrument that is self-orientating due to the circular disc or halo set at the equinoxs. In use, once the instrument has been leveled and adjusted for latitude, the dial is rotated on its base until the shadow of the upper edge of the halo falls on the appropriate date when local solar time will be shown by the gut-gnomon. The principle of operation is similar to that which underlies the functioning of the common pillar dials. 

According to the footnote written in 1995, when this piece was originally offered at auction, only one other example of the dial was known. The other dial is in the Instituito Geografico-Militaire, Florence and is illustrated in Bulletin of the Scientific Instrument Society, No. 45, 1995, pl. 7 fig. 3

Watches

|
New York