[f. THERMOMETER + -GRAPH.) A self-registering thermometer.
1837. Macdougall, trans. Graah’s E. Coast Greenland, 20–1. Mr. Vahl having, on its [the gale’s] cessation, let down his thermometrograph, found the temperature of the sea, at the depth of 110 fathoms, to be 5°·50, while that at the surface was 6°·3, and the atmosphere’s 8°·6.
1877. Knight, Dict. Mech., Thermetograph [sic], a self-registering thermometer, recording the maximum and minimum of temperature in a given time.
