Classic brass Captains style thermometer.
The thermometer: the ship's captain or meteorologist can use these to determine changes, patterns, and relativities to other input to prepare the vessel and crew for deteriorating or improving weather ahead. Or simply just how to dress.
Wall mount and ready to use. Heavy glass and heavy solid brass casing and hardware. This matches our 4-1/2" Brass Captains barometer, clock and hygrometers.