“Gonio-Microscope” and Its Metallurgical Applications

Abstract

A new instrument, Gonio-Microscope, has been developed which permits measurement of the direction of the normal to a plane surface with an area as small as 10×10µ². The accuracy of the measurement is within ±0.5 deg. for a small component plane of an etch pit. A special feature of this instrument is that the measurement is made simultaneously with the observation of the position and shape of the plane being measured. This was successfully applied to the determination of grain orientation, structure of twin bands and slip bands, and the shapes of tapered cross sections of razor blades.