Abstract
M. LAURENT of Paris has constructed “magic mirrors” giving similar effects to those brought from Japan, but of glass silvered at the back instead of metal. By engraving patterns at the back and silvering the front surface, the mirror has a perfectly plane surface only when the air-pressures at the front and back are equal. If the air behind be compressed or rarefied the thinner parts will have relatively a greater convexity or concavity than the rest, and in the disk of light which the mirror reflects on to a wall from a luminous point the pattern engraved on the back will accordingly appear dark or light.
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Physical Notes . Nature 23, 616–617 (1881). https://doi.org/10.1038/023616a0
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DOI: https://doi.org/10.1038/023616a0