Assertion: simple device | /r/CapableOf | measure the area of a closed shape
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Source sentences:
text: There are notable non-electrical analog devices, such as clocks (sundials, water clocks, pendulum clocks, analog watches), the astrolabe, slide rules, the governor of a steam engine, the planimeter (a simple device that measures the area of a closed shape), Kelvin's mechanical tide predictor, acoustic rangefinders, servomechanisms (e.g. the thermostat), a simple mercury thermometer, a bathroom scale, and the speedometer