| 摘要 |
A controlled temperature oven provided with a pyrometer having a temperature sensitive resistance, an electrical heating element, a nonlinear heat sensing element within the oven chamber, and a variable power supply electrically connected to the heating element, the variable power supply being controlled in response to the nonlinear heat sensing element, and a switch assembly having a plurality of pairs of single pole double throw switches with a common actuation member for each pair of switches, one switch of each pair being connected in a first cascade of switches and the other switch of each pair being connected in a second cascade of switches, the switches of the first cascade of switches connecting one of a plurality of manually adjustable resistors to the variable power supply to control the output thereof, and the switches of the second cascade of switches connecting one of a plurality of variable resistors to the pyrometer to indicate the temperature selected by the switches of the first cascade of switches.
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