thermal bulb

thermal bulb

[′thər·məl ¦bəlb]
(engineering)
A device for measurement of temperature; the liquid in a bulb expands with increasing temperature, pressuring a spiral Bourdon-type tube element and causing it to deform (unwind) in direct relation to the temperature in the bulb.
References in periodicals archive ?
Traditional thermal bulbs will be replaced with energy-saving compact fluorescent lamps.