Micromechanical tuning fork. Coloured scanning electron micrograph (SEM) of a micromechanical device that acts as a tiny tuning fork. It has been made out of silicon on the surface of a silicon chip. When an electric voltage is applied, it resonates with a reliable frequency, allowing it to be used in timing devices. Placing the timing device on the same silicon chip as the integrated circuit it controls allows devices such as digital clocks to be decreased in size. Magnification: x300 at 6x6cm size.

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