Archive image from page 59 of Development of a spherical acrylic. Development of a spherical acrylic plastic pressure hull for hydrospace application . developmentofsph00stac Year: 1970 Figure 28. Circular disc after thermoforming at 300 F into spherical sector with a 33-inch radius of curvature; note thermocouples embedded in acrylic plastic for measurement of temperature. arm with dial indicator 5 0 5 Lateral Radius (inches) Figure 29. Actual sphericity of the mold for thermoforming sectors with 33-inch radius of curvature. 56

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Photo credit: © Actep Burstov / Alamy / Afripics
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