Pebble Bed Heater in Propulsion Systems Laboratory (PSL) No. 2.
Mechanics install a pebble bed heater in Propulsion Systems Laboratory (PSL) No. 2 to simulate the high temperatures produced at supersonic and hypersonic speeds. (11/13/1958)
Image Credit: NASA/PAUL RIEDEL
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https://www.nasa.gov/image-detail/grc-1958-c-49138/
Image CreditNASA/PAUL RIEDEL
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