Discover a rare mid-19th century rosewood Patent Compensating Portable Barometer by William Harris and Son of London. This exquisite piece features a rectangular silvered scale with a U-shaped mercury tube and a central thermometer mercury tube. The plate is elegantly engraved with the maker's mark 'William Harris & Son 50 High Holborn London' and the unique serial number 283.
The barometer is thoughtfully designed with a brass knob for adjusting a steel recording pointer, and a rackwork vernier adjustment controlled by a brass knurled knob. An angled steel pointer is also included for recording temperature. The bottom edge of the barometer boasts a manual adjustment recording disc, meticulously engraved with a barometric scale.
Standing at 33cm high and 7.5cm wide, this exceptional piece is a testament to the craftsmanship and precision of William Harris and Son. Don't miss the opportunity to own this remarkable mid-19th century barometer, available at Duggleby Auctioneers.