At the Naval Boiler and Turbine Laboratory boiler efficiencies are determined simultaneously by the input-output and heat-loss methods. This paper discusses the procedures followed in testing boilers for efficiency and the results and relative merits of the two methods. Naval boilers are described as well as the instrumentation and weigh systems utilized in efficiency determinations. Results from over 200 tests performed on some 35 boilers are used as the basis for comparison between input-output and heat-loss efficiency.

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