A collection of twenty one assemblies for Optical alignment in the Wind tunnel to ensure axis of model is precisely aligned , comprising Frosted Glass Slides , Framework , Holders and fittings. A collection of twenty one assemblies for Optical alignment in the Wind tunnel 1950-1970
Main frame assembly, part of x-ray installation, by the Cavendish Electrical Co., London, England, 1905-1909. Main frame assembly 1905-1909