A rare W & S Jones Cometarium,  English, early 19th century,
Lot 137
A rare W & S Jones Cometarium, English, early 19th century,
Sold for £39,650 (US$ 62,127) inc. premium

Lot Details
A rare W & S Jones Cometarium,  English, early 19th century, A rare W & S Jones Cometarium, English, early 19th century,
A rare W & S Jones Cometarium, English, early 19th century,
signed W & S Jones, 30 Holborn, LONDON the mahogany case containing the hand cracked geared mechanism, mounted on top with a brass model of Sun and comet marker traversing an elliptical tract, the pointer mounted below the Sun moves over the radial divisions of the outer brass scale as the pointer (replaced) moves over the small circular dial showing the time and divided in to 30 degrees divisions or signs, replaced handle at the side, the case, scale 12 by 10 by 7in (30.5 by 25 by 18cm)

Footnotes

  • A cometarium is a mechanical device designed to illustrate the motion of a comet about the Sun. The key feature of the instrument is the ability to show an apparent increase in orbital velocity as the comet marker moves from aphelion (the point in an elliptical orbit that is at the greatest distance from the Sun) to perihelion (the point in an elliptical orbit that is closest to the Sun). This demonstrates Kepler's second law of planetary motion.

    The model that ultimately became known as the cometarium was first made by J T Desaguliers in the early 1730s. He used his model, which described the orbit of the planet Mercury, to the assembled Fellows of the Royal Society on the 8th March 1732.

    Benjamin Martin first used the term cometarium in the early 1740s and in the mid 1750s James Ferguson used the expression equal-area machine for the device.

    The only other cometarium by W & S Jones know to be extant is in the Science Museum, London.

Auction information

This auction is now finished. If you are interested in consigning in future auctions, please contact the specialist department. If you have queries about lots purchased in this auction, please contact customer services.

Buyers' Obligations

ALL BIDDERS MUST AGREE THAT THEY HAVE READ AND UNDERSTOOD BONHAMS' CONDITIONS OF SALE AND AGREE TO BE BOUND BY THEM, AND AGREE TO PAY THE BUYER'S PREMIUM AND ANY OTHER CHARGES MENTIONED IN THE NOTICE TO BIDDERS. THIS AFFECTS THE BIDDERS LEGAL RIGHTS.

If you have any complaints or questions about the Conditions of Sale, please contact your nearest customer services team.

Buyers' Premium and Charges

For all Sales categories excluding Wine, Coins & Medals and Motor Cars and Motorcycles:

Buyer's Premium Rates
25% on the first £50,000 of the Hammer Price
20% from £50,001 to £1,000,000 the Hammer Price
12% from £1,000,001 of the Hammer Price

VAT at the current rate of 20% will be added to the Buyer's Premium and charges excluding Artists Resale Right.

Payment Notices

Payment in advance: by cash, check with banker's card, credit card, bank draft or traveler's cheque.

Payment at collection: by credit or debit card.

Credit card charges: a surcharge of 2% is applicable when using Mastercard, Visa and overseas debit cards.

Shipping Notices

For information and estimates on domestic and international shipping as well as export licenses please contact Bonhams Shipping Department.

Contacts
  1. Jon Baddeley
    Specialist - Scientific Instruments
    Bonhams
    Work
    Montpelier Street
    London, United Kingdom SW7 1HH
    Work 0207 393 3872
    FaxFax: +44 20 7393 3873
Similar Items