19TH C INLAID MARBLE DESK THERMOMETER

A 19th Century Black Marble Obelisk Shaped ThermometerThe shaped column inlaid with malachite to follow the shape of the obelisk and surrounding a likewise shaped thermometer plate reading the temperature to the left of the plate and temperature indication ie Frozen Temperate Summer Heat and Blood HeatThe obelisk resting on a square plinth inlaid with marbles to form rising flowers and leavesThe plinth over a stepped baseDate circa 1840Height 14 inches 36cmWidth 5 12 inches 14cmDepth 5 12 inches