Abstract
This is not intended to be a treatise on the way to investigate air accidents. That story has been told many times and there is much authoritative literature on the subject already—besides I am thirteen years out of date. My aim is to tell something about the way it began and how, in little more than 30 years, it has become a really scientific art, always keeping step with the advance of aircraft and powerplant design and yet never gaining a sufficient lead to put a stop to accidents.

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