Archive image from page 156 of Development of a spherical acrylic. Development of a spherical acrylic plastic pressure hull for hydrospace application . developmentofsph00stac Year: 1970 i the top polar acrylic plastic pentagon. Note that the beveled bearing surface nor cracking at the location that corresponds to the O-ring groove on the

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Photo credit: © Actep Burstov / Alamy / Afripics
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