Photopyrometric comparison analyzer at NACA's Lewis Flight Propulsion Laboratory (now Glenn Research Center), c. 1950.
Fullsize image: https://diqn32j8nouaz.cloudfront.net...r_fullsize.jpg
https://diqn32j8nouaz.cloudfront.net...n_analyzer.jpg
Previously:
https://www.homemadetools.net/forum/...837#post179141
https://www.homemadetools.net/forum/...249#post176893
https://www.homemadetools.net/forum/...395#post177425
https://www.homemadetools.net/forum/...281#post177015
https://www.homemadetools.net/forum/...114#post176359
