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Scientific American

September 10, 1910

1 min read

Electro-Photographic Method of Registering Heart Beats, Multiplication of Color Photographs by Contact Printing, and more

By Jacques Boyer

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This article was originally published with the title “Electro-Photographic Method of Registering Heart Beats, Multiplication of Color Photographs by Contact Printing, and more” in Scientific American Magazine Vol. 103 No. 11 (September 1910), p. 197
doi:10.1038/scientificamerican09101910-197

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