GEC Velometer, A portable electrical vibration and velocity measuring instrument supplied with interchangeable probes and magnetic mounts. Designed for testing and diagnosing vibration in rotating machinery such as turbines, motors, pumps, and generators. Engineers used instruments like this during maintenance inspections in power stations, factories, and heavy industry to detect imbalance or mechanical faults. Mid-20th century industrial diagnostic equipment, c.1940s–1960s.
