Among other applications of the said invention which may be enumerated,
it is particularly advantageous for rendering visible clock or watch
faces and other indicators--such, for example, as compasses and the
scales of barometers or thermometers--during the night or in dark places
during the night time. In applying the invention to these and other
like purposes there may be used either phosphorescent grounds with
dark figures or dark grounds and phosphorescent figures or letters,
preferring the former. In like manner there may be produced figures and
letters for use on house-doors and ends of streets, wherever it is not
convenient or economical to have external source of light, signposts,
and signals, and names or marks to show entries to avenues or gates, and
the like.
The invention is also applicable to the illumination of railway
carriages by painting with phosphorescent paint a portion of the
interior, thus obviating the necessity for the expense and inconvenience
of the use of lamps in passing through tunnels. It may also be applied
externally as warning-lights at the front and end of trains passing
through tunnels, and in other similar cases, also to ordinary carriages,
either internally or externally.
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