TWO ANEROID POCKET BAROMETERS WITH ALTIMETERSDOLLOND, LONDON, LATE 19th CENTURYBoth with 1.75 inch circular silvered register calibrated in barometric inches divided into twentieths with the ual observations, signed DOLLOND, LONDON to centre within outer revolving altimeter scale, the first numbered No. 6995 to centre, in gilt brass watch-type case and with outer silk-lined leather protective outer case, the second unnumbered and in an aluminium case with knurled altimeter adjtment crown within the spension ring, (2).Each instrument 5cm (2ins) diameter, 1.5cm (0.625ins) deep.Provenance: The archive collection of Barometer World Meum, Merton, Devon.Peter Dollond is recorded in Banfield, Edwin BAROMETER MAKERS AND RETAILERS 1680-1860 as born 1730 and died 1820. He was the son of John Dollond, a Huguenot silk weaver and started biness as an optician in 1750. He was joined by his father in 1752 until his death in 1761, and then by his brother, John, until his death in 1804. The family biness was continued by Peter Dollond's nephew, George Huggins, who changed his surname to Dollond. George Dollond became instrument maker to William IV and Queen Victoria, exhibited at the Great Exhibition in 1851 and died 1856. The firm became one of the largest makers and suppliers of scientific and optical instruments and continued trading under vario guises throughout the 19th and 20th centuries.