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With the technological advancements several kitchen appliances came into existence. The nineteenth century created numerous kitchen use inventions like potato masher, potato peeler, food choppers and sausage stuffers. In 1927, Norwegian invented the cheese slicer. He took a thin slice of steel, cut it and bent it down while the back side of the steel slice was bent up. This he used to slice cheese effectively and easily. It was during a radar-related research project around 1946 that Dr. Percy Spencer, an engineer with the Raytheon Corporation, noticed something very unusual. He was testing a new vacuum tube called a magnetron and he discovered that the candy bar in his pocket had melted. He made several experiments then he fashioned a metal box with an opening into which he fed microwave power. The energy created a higher density electromagnetic field. When food placed under the box, the temperature of the food rose rapidly. This gave way to the invention of microwave.
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