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Sam
 
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Default temperature control inside gas oven?

hi folks,

had a question about how temperature is controlled in a gas oven.
till now i used to think that the dial(marked in degrees celcius)
regulates the amount of gas that can reach the oven. however i noticed
that along the insides are are two copper tubes which are closed at
one end. my guess is that they have something to do with temperature.
anyone know how this works?

thanks,
Sam