With Light Waves

Explains the principles of measurement with light waves—the nature of light waves; the reflection and refraction of monochromatic light by a glass surface; the cause of interference bands; the use of these bands in ultra-precision measurement; and their translation into millionths of an inch. Demonstrates procedures in gage block inspection—the comparison of gage block for height; the meaning of circular and parallel bands on gage surfaces; the precautions necessary in measurement with light waves; and the inspection procedures followed. The film strip in addition to reviewing the picture, provides practice in interpreting band arrangement.