| 摘要 |
A continuous developing machine for exposed photographic material has a vessel with one or more outlets close to its bottom and one or more inlets at its top, conduits which connect the outlets with the inlets, a pump which circulates the developing solution from the outlets to the inlets, and a heating device which is installed in the conduits downstream of the pump and has a primary heater which is activated with a first delay whenever the temperature of developed solution downstream of the heating device drops below and is deactivated with a second delay whenever the temperature of developing solution rises above a preselected value, and an adjustable auxiliary heater which is actuated during each interval of admission of a liquid replenisher into the conduits upstream of the pump. The auxiliary heater is adjusted in dependency on changes in temperature and/or rate of admission of the replenisher. The temperature of the mixture of developing solution and replenisher is monitored immediately downstream of the heating device for the purpose of activating or deactivating the primary heater. A heat exchanger preheats the replenisher prior to admission into the conduits upstream of the pump.
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