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Sunday, October 11, 2009

Automatic or Pop-Up Toasters



The toaster is typically a small electric kitchen appliance designed to toat multiple types of bread products. There are also non-electrical toasters that can be used to toast bread products over an open fire or flame.

Modern toasters are typically one of three varieties: pop-up toasters, ovens, and conveyors.
In earlier days, the completion of the toasting operation was determined by a mechanical clockwork timer; the user could adjust the running time of the timer to determine the degree of "doneness" of the toast, but the first cycle produced less toasted toast than subsequent cycles because the toaster was not yet warmed up.
Toasters made since the 1930s frequently use a thermal sensor, such as a bimetallic strip located close to the toast. This allows the first cycle to run longer than subsequent cycles. The thermal device is also slightly responsive to the actual temperature of the toast itself. Like the timer, it can be adjusted by the user to determine the "doneness" of the toast.

In pop-up or automatic toasters, bread slices are inserted vertically into the slots (generally only large enough to admit a single slice of bread) on the top of the toaster. A lever on the side of the toaster is depressed, activating the toaster. When an internal device determines that the toasting cycle is complete, the toaster turns off and the toast pops up out of the slots. The heating elements of a pop-up toaster are usually oriented vertically, parallel to the bread slice - although there are some variations.
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