The National Measurement system for time and frequency
Allan S. Risley · 1976
The results of a study of the National Measurement System for Time and Frequency are given.The system is viewed from three vantage points: (1) The Instrumentation that provides sources of time and frequency (T&F).(2) The Suppliers and Users of T&F.(3) The Calibration hierarchies for T&F sources.An attempt is made to determine the technological, scientific, economic, and social effects of the system.Predictions are made about possible important changes in the system.The past, present, and possible future positions of NBS in the system is described in detail.