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One of sixteen shapes, tested for exposure to rain, hail, dust & sand.

One of sixteen shapes, tested for exposure to rain, hail, dust & sand.

1960-1970
Sixteen Test pieces of Hemispherical, Conical and truncated shapes, tested on a Rocket track for the evaluation of Erosion and Charring when exposed to rain, hail, dust, sand , etc.

Sixteen shapes, tested for exposure to rain, hail, dust & sand.

1960-1970