Thermometer

An instrument used for measuring degrees of heat and cold of water and air. It consists of a glass tube containing mercury or colored alcohol, and is secured against a graduated scale.

Deep Sea Thermometer. A thermometer so constructed as to resist the pressure of, water at great depths, and to record the temperature of those waters.

Dry Bulb Thermometer. The ordinary thermometer for recording air temperatures.

Wet Bulb Thermometer. Also known as the Hygrometer. A thermometer having. Its bulb wrapped in thin absorbent muslin with a wick reaching from it into a small cup of water. This instrument measures the humidity of the air.