Diathermometer :: Diathermometer (n.) An instrument for examining the thermal resistance or heat-conducting power of liquids.
Geothermometer :: Geothermometer (n.) A thermometer specially constructed for measuring temperetures at a depth below the surface of the ground.
Telethermometer :: Telethermometer (n.) An apparatus for determining the temperature of a distant point, as by a thermoelectric circuit or otherwise..
Thermometer :: Thermometer (n.) An instrument for measuring temperature, founded on the principle that changes of temperature in bodies are accompained by proportional changes in their volumes or dimensions..
Water Thermometer :: Water thermometer () A thermometer filled with water instead of mercury, for ascertaining the precise temperature at which water attains its maximum density. This is about 39? Fahr., or 4? Centigrade; and from that point down to 32? Fahr., or 0? Centigrade, or the freezing point, it expands..