JOHN ROGER ARNOLD, NO. 339, CIRCA 1825
Details
A Regency mahogany one-day marine chronometer with Z balance
John Roger Arnold, No. 339, circa 1825
The silvered dial signed and numbered Arnold, LONDON. 339, Roman hour numerals, subsidiary seconds dial (at VI), pinned plates the top-plate inscribed John R. Arnold, London, Invt et Fecit No. 339, Arnold escapement, Z bimetallic balance with non-ferrous outer and steel inner laminae with brass cross-arm, undersprung blued steel helical balance spring, Arnold detent with steel locking pallet (repairs), brass bowl and square section gimbal, Arnold three-tier mahogany box with visual dovetailing and ebony edging to top lid, bone ivory plaque (blank) to front of middle section, external brass drop handles
78 mm. dial diam., 175 mm. sq. box
John Roger Arnold, No. 339, circa 1825
The silvered dial signed and numbered Arnold, LONDON. 339, Roman hour numerals, subsidiary seconds dial (at VI), pinned plates the top-plate inscribed John R. Arnold, London, Invt et Fecit No. 339, Arnold escapement, Z bimetallic balance with non-ferrous outer and steel inner laminae with brass cross-arm, undersprung blued steel helical balance spring, Arnold detent with steel locking pallet (repairs), brass bowl and square section gimbal, Arnold three-tier mahogany box with visual dovetailing and ebony edging to top lid, bone ivory plaque (blank) to front of middle section, external brass drop handles
78 mm. dial diam., 175 mm. sq. box