Abstract
PROF. C. V. RAMAN'S suggestion (NATURE, October 20, p. 242) for improving visibility at sea was put forward by me some years ago in “Elementary Seamanship” (Griffin and Co.), and is useful not only for objects above the surface, but for those—like coral-reefs—some little distance below the surface. In the last instance, when there is a slight ripple on the surface of the water it is often difficult to detect them even when navigating with the sun astern. The use of the Nicol prism clears up in a great measure this difficulty.
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WILSON-BARKER, D. Methods of Improving Visibility. Nature 108, 337 (1921). https://doi.org/10.1038/108337b0
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DOI: https://doi.org/10.1038/108337b0
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