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SQUIDs, the Josephson effects and measurement

The author describes the basic properties of superconductivity which have had a great impact on the science of metrology in the 1970s and 1980s. These have led to important applications of flux quantization and the Josephson effects in areas as diverse as the search for gravity waves and the provision of the maintained standard of voltage. Some developments, such as macroscopic quantum effects in superconducting electronics as well as the impact of high-temperature superconductivity on precise measurements, are included.