![](http://www.alamy.com/thumbs/6/2C56DA21-4256-403F-BE1E-9F629C8D9BB4/W1D9RJ.jpg)
Archive image from page 96 of Development of a spherical acrylic. Development of a spherical acrylic plastic pressure hull for hydrospace application . developmentofsph00stac Year: 1970 Figure 61. Bottom polar penetration closure and retaining ring for the 15-inch- diameter model capsule: exterior view.
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Photo credit: © Actep Burstov / Alamy / Afripics
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