Mirror of Literature,  8 (1826), 221.

Power of the Sun's Rays



Extract, Reportage

Publications extracted:

Gentleman's Magazine


Light, Machinery, Engineering

    The writer reports the observation of Mr Mackintosh, the 'contractor for the government works carrying on at Stonehouse-Point, Plymouth', that, even at twenty-five feet under water, light was focused by the 'convex glasses' in the upper part of the diving bell used in the works to the extent that it could burn the workmen's clothes.

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