Comments on “A new waveguide flow calorimeter for levels of 1–20 W”

In the December 1974 issue, a paper
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described a recently developed dual-flow microwave calorimeter with very high precision and accuracy. A control and coolant circulation console was described as operating with a series of dual waveguide loads where precision was achieved by the inherent balance between one load heated by the unknown microwave power and the other by an accurately measured dc power while the errors were estimated by the use of an auxiliary thermocouple measuring the temperature difference between the waveguide bodies.