Abstract
BEAMS of light may be employed to reveal the existence of floating matter in the air; or the floating matter may be employed to reveal the track of the beams.
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TYNDALL, J. On Floating Matter and Beams of Light . Nature 1, 499–501 (1870). https://doi.org/10.1038/001499a0
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DOI: https://doi.org/10.1038/001499a0