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By Speakman J
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Extra resources for An introduction to the electronic theory of valency
31 Á 32 The Way Kitchens Work Patent no. 27,615 How Cork Removers Work Most corkscrews give you some mechanical leverage to pull the cork up, which is helpful, because it takes between 25 and 100 pounds of force to yank out a cork. The model shown at the beginning of the chapter, called a wing corkscrew, is a popular, easy-to-use design. You twist the top handle, which doubles as a bottle cap remover, to embed the screw in the cork. As the screw buries itself in the cork, the wing handles rise out to the sides.
C. Armstrong in 1931 (patent number 1,816,994). His invention included an automatic heat cut-off after enough water had passed through the grounds, rendering the coffee-making process automatic. How Coffee Urns Work The coffee urn is a large percolator. (See the chapter on coffee makers, p. ) It sends hot water up a tube to splash onto the grounds and drip back into 28 Á Coffee Urn 29 Patent no. 1,816,994 the reservoir. When the water/coffee in the reservoir has been heated to the right temperature, the thermostat cuts power to the heating coil and turns on the ready light, telling you to grab a cup.
It directly drives a centrifugal fan that draws air in from beneath the centrifugal fan bread maker and pushes it out between the machine’s inner cylinder and outer cover. This is one more precaution designed to prevent the user from getting burned. Not all machines have this second motor. Bread machines seem to do best with wheat ﬂour—ﬂour that contains gluten. C AN O PENER History of the Can Opener Consider this curious historical fact: tin cans were in use for nearly half a century before the can opener was invented.