Granite Closeup shows what happens in a 20 second exposure. Material, center, fuses and cracks radiate out to sides as whole block is weakened.
Digital Commonwealth — Boston Public Library

Granite Closeup shows what happens in a 20 second exposure. Material, center, fuses and cracks radiate out to sides as whole block is weakened.

[ca. November 1966]

CC0 — Public Domain
Digital Commonwealth — Boston Public Library

[Information from item housing] Lasers

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