A NEW COMPOSITION FOR COATING SUB- STANCES TO BE USED IN LIEU OF SLATE FOR BUILDING AND WRITING PURPOSES
Year: 1877

page_text: LETTERS PATENT to John Alderton Ditch, of Hastings, in the County of
Sussex, for the Invention of "A NEW COMPOSITION FOR COATING SUB-
STANCES TO BE USED IN LIEU OF SLATE FOR BUILDING AND WRITING PURPOSES."
700 30
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PROVISIONAL SPECIFICATION left by the said John Alderton Ditch at the
Office of the Commissioners of Patents on the 14th September 1877.
JOHN ALDERTON DITCH, of Hastings, in the County of Sussex. A NEW COM-
POSITION FOR COATING SUBSTANCES TO BE USED IN LIEU OF SLATE FOR BUILDING
AND WRITING PURPOSES."
"
The new composition consists in mixing the various materials or their chemical
equivalents, in the proportions or near thereto, as herein-after appear, for the
purpose of providing, when applied as a coating to any convenient and suitable
substance, a substitute for slate for building, writing, and other purposes.
The mixture and proportions for coating substances for exterior work are as
follows: One quart of mythelated spirit or its equivalent, half a pound of gum
shellac, one quarter of a pound of flower of emery.
For coating substances to serve as writing slates, add powdered glass, rotten
stone, or pumice stone, together with lamp black or Paris green, sufficient to give
the desired shade of color.
Other powdered substances, such as chalk, brick, slate, or stone may be used for
the purpose of giving a body or abrading surface to the composition.
A convenient way of making writing slates is to coat millboard with the new
compostition, frame the board, and mount it on an easel so arranged that it can be
closed and shut up when not in use.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by the
said John Alderton Ditch in the Great Seal Patent Office on the 13th March
1878.
JOHN ALDERTON DITCH, of Hastings, in the County of Sussex. "A NEW COM-
POSITION FOR COATING SUBSTANCES TO BE USED IN LIEU OF SLATE FOR BUILDING
AND WRITING PURPOSES."
for the
The new composition consists in mixing the various materials or their chemical
equivalents, in the proportions or near thereto, as berein-after appear,
purpose of providing, when applied as a coating to any convenient and suitable
substance, a substitute for slate for building, writing, and other purposes.
The mixture and proportions for coating substances for exterior work are as
follows: One quart of mythelated spirit or its equivalent, half a pound of gum
shellac, one quarter of a pound of flower of emery.
For coating substances to serve as writing slates, add powdered glass, rotton
stone, or pumice stone, together with black coloring matter or Paris green, sufficient
to give the desired shade of color.
Other powdered substances, such as chalk, brick, slate, or stone may be used for
the purpose of giving a body or abrading surface to the composition.
A convenient way of making writing slates is to coat millboard with the new
composition, frame the board, and mount it on an easel so arranged that it may be
closed and shut up when not in use.
In witness whereof, I, John Alderton Ditch, have hereunto set my hand and
seal, this Eleventh day of March, in the year of our Lord 1878.