1. A recording thermometer used in meteorology to obtain a continuous record of temperature changes over a period on a graph.
2. A record so obtained.
3. A record obtained by the technique of thermography.
Geology and Earth Sciences
Instrument that gives a continuous record of temperature for a day or for a week. The device uses a helical strip of two metals with differing coefficients of expansion. The resulting opening and closing of the coil operates a pen which produces a line over a calibrated chart on a round clock drum.