The intensity of the light emitted by this composition after exposure is
considerable, and largely greater than the light produced by any of the
substances heretofore known.
The hereinbefore described substance may be ground with oil and used
like ordinary paint; or it may be ground with any suitable varnish or be
mixed in the manner of water colors; or it may be employed in any other
suitable and well-known manner in which paints are employed.
My improved luminous substance is adapted for a great variety of
uses--for instance, for painting business and other signs, guide boards,
clock and watch dials, for making the numbers on houses and railway
cars, and for painting all surfaces which are exposed periodically to
direct or indirect light and desired to be easily seen during the night.
When applied with oil or varnish, my improved luminous substance can
be exposed to the weather in the same manner as ordinary paint without
suffering any diminution of its luminous property. I claim as my
invention the herein described luminous substance, consisting of
calcined chalk, sulphur, and bismuth, substantially as set forth.
Merrill B. Sherwood, Jr., of Buffalo, N.
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