Abstract
A PAPER was read to the Illuminating Engineering Society on February 11 by J. G. Holmes on the recognition of coloured light signals. The apparatus described in the first part of the paper was made to provide a spot of coloured light suitable for observation under conditions comparable with night signalling, and capable of variation through a wide range of colours, the energy distributions of which were similar to those of the usual signalling colours.
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Recognition of Coloured Light Signals. Nature 147, 423–424 (1941). https://doi.org/10.1038/147423b0
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DOI: https://doi.org/10.1038/147423b0