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One of the principal reasons for holding a symposium such as this is to evaluate progress in a particular line of endeavor and to make some attempt to foresee the future. Metallography, as one recognizes that branch of metallurgy, is now approximately a century old. During all of this time metallographers have been increasingly aware of the need for a means of determining the composition of separate phases in situ in the microstructure they have been studying. In fact, a tremendous amount of effort has been expended in trying to obtain such essential data by various elaborate indirect methods.
Wyman, LeRoy L.
Consultant to Division Chief, National Bureau of Standards, Washington, D. C.,