This paper describes a high precision thermostat designed in our laboratory. In the usual thermostat, the temperature of water in the bath is, in general, controlled by a regulating electric heater.
In our apparatus the bath temperature is regulated by using many electric bulbs instead of the usual resistance wire.
Since the radiation energy from the bulbs is supplied uniformly and quickly to the water in the bath, it is possible to keep the temperature of water at the desired temperature within a deviation of ±0.001°C.
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