Timekeeping instruments. Wrist-chronometers with spring balance oscillator Ingestion-build-58863 where applicable (see 10

where applicable (see 10

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appropriate to any particular type of sound source

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

Timekeeping instruments. Wrist-chronometers with spring balance oscillator Ingestion-build-58863 where applicable (see 101 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.