拍品 6
6
An early Victorian steel and brass pocket chronometer balance attributed to J.R. Arnold; an incomplete brass and blued steel staple balance attributed to E.J. Dent; three steel affix bars with brass terminals attibuted to Sir John Airy (5)
No VAT will be charged on the hammer price, but VA… 顯示更多
An early Victorian steel and brass pocket chronometer balance attributed to J.R. Arnold; an incomplete brass and blued steel staple balance attributed to E.J. Dent; three steel affix bars with brass terminals attibuted to Sir John Airy (5)

細節
An early Victorian steel and brass pocket chronometer balance attributed to J.R. Arnold; an incomplete brass and blued steel staple balance attributed to E.J. Dent; three steel affix bars with brass terminals attibuted to Sir John Airy (5)
注意事項
No VAT will be charged on the hammer price, but VAT at 15% will be added to the buyer's premium which is invoiced on a VAT inclusive basis.

拍品專文

Sir George Biddell Airy (1802-1892) was the Lucasian Professor of Mathematics at Cambridge and Astronomer Royal from 1835-1881. In 1875 Airy introduced his famous auxilliary 'bar' which he used for the fine adjustment to the compensation of a conventional marine chronometer balance. He was able to insist that all chronometers, tested at the Royal Observatory and bought for use by the Royal Navy, were fitted with the bar he had invented. However certain balances, such as Kullberg's flat rim balance, could not be fitted with it so the stipulation was quietly dropped.