. The Earth beneath the sea : History . Fig. 1. Probe for measuring temperatixre gradient. (By courtesy of British Petroleiim Co.) A thermistor measures a single temperature and therefore needs careful calibration or matching if it is one of a pair used to determine a small tempera- ture difference. The resistance change of a thermistor is typically 5%/°C. The that can be obtained from a bridge of which it forms one arm is hmited by the heating produced by the measuring current, but is of the order of 3 mV for °C. This may be used directly to drive an insensitive and robust ga

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. The Earth beneath the sea : History . Fig. 1. Probe for measuring temperatixre gradient. (By courtesy of British Petroleiim Co.) A thermistor measures a single temperature and therefore needs careful calibration or matching if it is one of a pair used to determine a small tempera- ture difference. The resistance change of a thermistor is typically 5%/°C. The that can be obtained from a bridge of which it forms one arm is hmited by the heating produced by the measuring current, but is of the order of 3 mV for °C. This may be used directly to drive an insensitive and robust galvanometer of the type used in seismic prospecting or the bridge may be made self-balancing by an amplifier connected in a servo-loop; a pen recorder may then be used. If an amplifier is to be used the bridge may be fed by ,

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Keywords: ., bookcentury1900, bookcollectionbiodivers, booksubjectoceanbottom