Abstract
Trials of this nature, which may last up to three years and in the fully comprehensive sense have been confined so far to warship machinery, are described in detail. Menton is made of trials of merchant-ship machinery rather more restricted in scope. The value of the comprehensive trials is emphasized, together with the planning of the programmes, operation, and some points of instrumentation. Some fundamental principles for the conduct of such trials are stated, based on experience, and the Author seeks to expand the circle in which these arc appreciated as sound axioms.
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