Abstract
NATURE, VOL 2, May 26, 1870 THE Admiralty have acceded to the request of the Royal Society by again placing Her Majesty's surveying steam-vessel the Porcupineat their disposal for another deep-sea expedition. A photometric apparatus has been contrived by Mr. Siemens to ascertain the depth to which solar light penetrates the sea.
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Seventy Years Ago. Nature 145, 831 (1940). https://doi.org/10.1038/145831a0
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DOI: https://doi.org/10.1038/145831a0