The Thermostat uses a bimetallic strip to break the circuit when the desired temperature is reached. This is a strip made up of two metals that have different thermal expansion characteristics, such as steel and copper. If one metal expands faster than the other, the strip will warp -- and the motion caused by this warping can do useful work (like breaking the circuit...) In this case, a cam exerts some force on the bimetallic strip using a spring force to keep the contact in place for varying amounts of temperature. For "high" settings, the bimetallic strip must warp a lot more to break the contact than for "low" settings.
Although the Krups Belgian Waffle Maker is our top pick, for the reasons laid out in the slides below, you should also consider the Oster CKSTWF2000 Belgian Waffle Maker in Stainless Steel, the All Clad 99011GT Stainless Steel Belgian Waffle Maker 2-Square, the Cuisinart WMR-CA Round Classic Waffle Maker, the Chef's Choice Pro Express Waffle Maker, and the Black & Decker G48TD 3-in-1 Waffle Maker.
This illustration anthropomorphizes the Twin-O-Matic and notes that post-war demand for small appliances will be a "half billion dollars" (about $100 billion in 2005 dollars), and encourages dealers to sign up to sell Manning-Bowman appliances. This is actually a very sad artifact, because the Manning-Bowman company was in deep financial distress because they could not get materials -- particularly chrome -- during World War II. This was an attempt to sign up dealers so that credit and financing could be obtained to last out the materiel shortages imposed by the War. It did not work, and soon thereafter, Manning-Bowman sank into a sea of red ink. The company's assets, including its spectacular Art Deco designs, were sold to the Bersted Corporation of Fostoria, Ohio. Berstead watered down the designs and made low-priced "drug store" versions of many Manning-Bowman appliances. (The Sandwich Grill on our Kitchen Aplliances page is a good example of this "cheapening" process.) Alas, Manning-Bowman met an inglorious end, but it was merely a foretaste of the vast wave of shoddy appliances made in faraway dictatorships that suffocate the American marketplace today.