The oven thermostat is spring-loaded and when the oven timer is set, it locks in place with a kind of ratcheting mechanism. When the timer ends the cooking, the thermostat automatically sets back to a lower temperature.
The thermostat knob turns free when the timer is on "manual" but when the oven is set to automatic, the timer knob becomes spring-loaded and it's held in place with some kind of ratcheting mechanism. When the timer ends the cooking cycle, instead of turning the oven off, it releases the ratcheting mechanism and the spring sets back the temperature at about 175°F.
See the video I made of it in the link below. Is this how the US ranges with the Meal Minder work? It seems to be a simpler system than I thought!
[this post was last edited: 10/2/2013-19:39]