Genre:

Extract, Reportage

Publications extracted:

Gentleman's Magazine

Subjects:

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.