With the present transmission type electron micro¬scope, the only method of observing the structure of gross metal specimens is by the replica technique. The first part of this report is a comparison of several variations of the replica technique applied to steel specimens in an attempt to determine which gives optimum results for the work at the Naval Research Laboratory. The second part of the re¬port describes a technique for observing exactly the same area in the electron and the light microscopes. A desired area may thus be found in the light microscope and then observed with the greater resolution and magnification of the electron microscope.
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