![](http://www.alamy.com/thumbs/6/544F590C-F6EB-44D4-817A-EF470619D1C7/W15W9G.jpg)
Archive image from page 183 of Development of a spherical acrylic. Development of a spherical acrylic plastic pressure hull for hydrospace application . developmentofsph00stac Year: 1970 (a) Nonpolarized white light.
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Photo credit: © Actep Burstov / Alamy / Afripics
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