抄録
Displacement of the mercury head of a mercury thermometer can easily be converted into the change in high electric resistance of 20-150 kΩ by using the writer's new recording type mercury thermometer which is made of a capillary with carbon film of about 5μ in thickness deposited on the inside wall enabling the resording or automatic controlling of liquid temperature to be made easy and simple. The thermometer is acid-proof, and is suited for plating baths. A durable and compact temperature controlling unit has been constructed in which a devised combination of a bridge circuit and a thyratron tube is used to function within a pre-arranged range of the resistance. With a BZ-RX type on-off micro switch, the accuracy of the unit is within ±0.1°C. Fineness of the control is such that a turn of 40 degrees in angle of the variable resistance of 20kΩ for adjusting the control corresponds to 1 degree C of the temperature variation.
