| 摘要 |
A mandrel, to hold the article to be heat treated and pressed, for example to hold a workpiece to form a cooking utensil, to which a bottom of highly heat-conductive material is to be applied, has a longitudinal opening formed therein through which a thermal-electric transducer, for example a thermocouple can be inserted, and its connections taken off; or, through which heat at the plate itself can be measured by infrared radiation. The thermocouple is connected to the control apparatus for the heater to cut application of electrical energy to an induction heater when tee heat at the interface of the mandrel, or an inserted thin heat-conductive sensing plate exceeds a predetermined value.
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