Wheel barometer mounted on a gilt and decorated wooden base. The barometric scale is divided into Paris inches. Above the barometer is a thermometer, also with a dial. The back of the instrument holds a large tube, originally containing alcohol, connected to a U-tube filled with mercury. The volume of alcohol varies with the changes in temperature, altering the height of the mercury column. A floating weight on the mercury column moves the thermometer pointer by means of a cord and pulley.