Micromechanic accelerometer. Coloured scanning electron micrograph of a micromechanical accelero- meter. The interlocking 'teeth' at centre are able to move relative to one another. They contain inductors, devices which generate an electric current in response to a change in the magnetic field. During a high acceleration or deceleration, the 'teeth' move towards each other, causing a change in the magnetic field. The signal from the inductors is then amplified to activate another system, such as an air-bag in a car. This device has been manufactured, using the same techniques used to make silicon chips, at Cornell University, USA. Magnification: x600 at 6x7cm size.
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