Dodge, Mary Mapes, 1830-1905 · [New York : Scribner & Co.] · leaf 606
of the in-ventor, this latest triumphof scientific investigationhas been named the Sperryarc. After the powerful raysof light leave their source,they strike a reflector inthe shape of a concave mir-ror where they are con-densed and made still more intense; then they arethrown out into space in…
Children's literature
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