A rare minimum maximum thermometer in a mahogany case.
The finely engraved silvered scale is signed:
CALLAGHAN & Co, LONDON.
23a New Bond St. Corner of Conduit St. London
Completed with another thermometer placed underneath. The thermometer can be hung on the wall and can be closed as a box.
Dimensions: 32 cm long and 9,5 cm wide.
England, ca 1860.
In very good original condition.