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A microwave oven or simply microwave is an electric oven that heats and cooks food by exposing it to electromagnetic radiation in the microwave frequency range. [1] This induces polar molecules in the food to rotate and produce thermal energy (heat) in a process known as dielectric heating .
1945 Microwave oven. A microwave oven with a turntable. A microwave oven cooks or heats food by dielectric heating. Cooking food with microwaves was discovered by Percy Spencer on October 8, 1945, while building magnetrons for radar sets at Raytheon. Spencer was working on an active radar set when he noticed a strange sensation, and saw that a ...
However, due to the existence of another Eclipse Stove Company that was not affiliated with Tappan's company, the company was renamed the Tappan Stove Company in the 1920s. [3] In 1950, Tappan acquired the Los Angeles-based O'Keefe & Merritt Stove Company and used the O'Keefe & Merritt name in the western United States from then until the late ...
O'Keefe and Merritt Manufacturing Company began operations in Los Angeles in 1920. [1] In 1950, Tappan purchased the company in a $5 million transaction, but management remained in Los Angeles and the company continued to produce 500-600 ranges each day.
1920: The first regularly operating radio station KDKA goes on air on 2 November 1920 in Philadelphia, USA. It is the first time electronics are used to transmit information and entertainment to the public at large. The same year in Germany an instrumental concert was broadcast on the radio from a long-wave transmitter in Wusterhausen.
1940: John Randall and Harry Boot would develop the high power, microwave generating, cavity magnetron, later applied to commercial Radar and Microwave oven appliances. [477] 1941: Polyester is invented by John Rex Whinfield and James Dickson. [478] 1942: The V-2 rocket, the world's first long range ballistic missile, developed by engineer ...
Sales grew 20 percent a year through the 1980s and early 90s. In 1988, American Pop Corn built a dedicated microwave popcorn plant to keep up with the demand and the competition.
The result was the egg exploding in the face of one of his co-workers, who was looking in the kettle to observe. Spencer then created the first true microwave oven by attaching a high-density electromagnetic field generator to an enclosed metal box. The magnetron emitted microwaves into the metal box blocking any escape and allowing for ...