The Channel Range of instruments is made of solid laquered brass with an opening latch and bevelled glass. The thermometer hygrometer can tell you the temperature and humidity using two separate devices in the same case.
Back Flange Diameter: 117mm
Face and Dial Diameter: 79mm
Other Models in the Brass Channel Range.
18029 Tide Clock
18032 Thermometer Hygrometer
18034 Mounted Clock and Barometer