The United States of America As Represented by the Administrator of the

Bobby R Elkins

William T White

Robert B Owen

Vernon W Keller

A viewing chamber which permits observation of a sample retained therein includes a pair of double window assemblies mounted in opposed openings in the walls thereof so that a light beam can directly enter and exit from the chamber. A flexible mounting arrangement for the outer windows of the window assemblies enables the windows to be brought into proper alignment. An electrical heating arrangement prevents fogging of the outer windows whereas desiccated air in the volume between the outer and inner windows prevents fogging of the latter.

Growing community of inventors

Huntsville, AL, United States of America

Bobby R Elkins