Timekeeping instruments. Wrist-chronometers with spring balance oscillator Ingestion-build-58863 Engine-driven main generators – Generators

Engine-driven main generators – Generators for supplying power to traction motors on the same vehicle or train

where applicable (see 10

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appropriate to any particular type of sound source

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Timekeeping instruments. Wrist-chronometers with spring balance oscillator Ingestion-build-58863 Engine-driven main generators – Generators1 Scope This International Standard lays down the definition of the term chronometer, describing the categories, the test programme and the acceptable minimum requirements for wrist chronometers. NOTE Wristwatches using a tuning fork oscillator are subjected to these tests pending the availability of separate standards.