The inventor of the microwave oven was Spencer of the United States. In 1939, he joined the Navy. After half a year, he retired due to injury. He entered the US Submarine Signal Company and began to contact various electrical appliances. Later, he entered the Raytheon Company, which specializes in manufacturing electronic tubes. Due to his excellent work, in 1940 he was promoted to the head of the new tube production technology by inspectors. As a result of his genius and diligence, he has completed a series of major inventions that have made many old scientists look at each other. At the time, British scientists were actively engaged in the research of military radar microwave energy. Two professors at the University of Birmingham designed a magnetron that efficiently produces high-power microwave energy. But at that time, the British and German were in the final stage of the battle, and the German planes bombarded the British Isles. Therefore, this new product cannot be produced domestically and has to seek cooperation with the United States. In September 1940, when British scientists visited the Raytheon Company with a sample of magnetron, they met with the talented Spencer and met each other. Under his efforts, the British and Raytheon companies jointly researched and manufactured magnetrons successfully. In an accidental opportunity, Spencer had the idea of ​​inventing a microwave oven. In 1945, he observed that microwaves could heat the surrounding objects. Once, when he walked through a microwave transmitter, his body was hot, and soon he found that the candy in his pocket was melted by the microwave. Another time, he placed a bag of corn kernels in front of the waveguide bell and observed the change in the corn kernels. He found the corn kernels the same as they were before the fire. The next day, he put an egg in front of the bell, and the egg suddenly exploded and he splashed him. This is more convincing that his microwave can make objects hot. Inspired by the Spencer experiment, Raytheon decided to work with him to develop a stove that can be cooked with microwave heat. A few weeks later, a simple stove was made. Spencer experimented with gingerbread. He cut the gingerbread into pieces and put it in the oven. He repeatedly changes the power of the magnetron during cooking to select the optimum temperature. After several trials, the smell of the food filled the room. In 1947, Raytheon introduced the first domestic microwave oven. However, the cost of such a microwave oven is too high and the life is too short, thus affecting the promotion of the microwave oven. In 1965, George Foster made a bold transformation of the microwave oven and worked with Spencer to design a durable and inexpensive microwave oven. In 1967, the microwave press conference and trade fair was held in Chicago and it was a great success. Since then, microwave ovens have gradually entered thousands of households. Since cooking food with microwaves is fast and convenient, it is not only delicious but also distinctive, so some people call it "women's liberators". Wire rope assembly
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