Boy lighting paper using the sun's rays focused by a concave mirror. Engraving from ''Natural Philosophy'' by E. Atkinson, London, 1878.

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Photo credit: © World History Archive / Alamy / Afripics
License: Licensed
Model Released: No

Keywords: ., archival, archive, atkinson, concave, engraving, heat, historical, history, london, mirror, natural, optics, philosophy, physics, reflection