Improvements in the Manufacture of Writing Tablets.
Year: 1891

page_text: Date of Application, 11th Nov., 1891
Complete Specification Left, 7th Dec., 1891-Accepted, 9th Jan., 1892
PROVISIONAL SPECIFICATION.
Improvements in the Manufacture of Writing Tablets.
I, HEINRICH CHRISTIAN REINHOLD, of Hamburg-Barmbeck, Heitmannstrasse
No. 27, Manufacturer, do hereby declare the nature of this invention to be as
follows:-
This invention has for object to provide a cheap and efficient substitute for the
expensive and easily breakable slates ordinarily used for writing purposes.
According to this invention improved writing tablets are prepared by the following
novel process :-
Cast iron plates or rolled sheets of iron, copper, brass or the like, of any suitable
size and thickness are carefully enamelled in the usual manner of enamelling such
substances and in any desired colour, and are then subjected to a blast of or are
ground with sand, emery or other hard granular substance, or have imparted to them
a dull, dead, or frosted appearance or condition by "beizen." The said plates or
sheets are then washed, after which the tablets are ready for use.
In order to provide a still more perfect writing surface, the enamelled plates
may be coated with a thin layer of glass. Furthermore the durability of the tablets
may be increased by the use of perforated plates the holes in which are filled up
with enamel in the enamelling operation, whereby the two enamelled writing surfaces
are connected together.
The plates may also, prior to the enamelling operation, be provided by stamping
with a suitable border so as to render a special frame unnecessary.
Writing tablets such as described have the advantages as compared with the slates
heretofore used of unbreakability and lightness.
They may be employed for many purposes, as they can be written upon, according
to the colour of the tablets, with either slate pencil, lead pencil, coloured pencils,
charcoal, chalk or other substances and the writing can be readily and easily rubbed
out without leaving any traces behind.
Dated this 10th day of November 1891.
H. C. REINHOLD,
By L. W., per F. B.
COMPLETE SPECIFICATION.
Improvements in the Manufacture of Writing Tablets.
I, HEINRICH CHRISTIAN REINHOLD, of Hamburg-Barmbeck, Heitmannstrasse
No. 27, Manufacturer, do hereby declare the nature of this invention and in what
manner the same is to be performed to be particularly described and ascertained in
and by the following statement :-
This invention has for object to provide a cheap and efficient substitute for the
expensive and easily breakable slates ordinarily used for writing purposes.
According to this invention improved writing tablets are prepared by the following
novel process :-
Cast iron plates or rolled sheets of iron, copper, brass or the like, of any suitable
size and thickness are carefully enamelled in the usual manner of enamelling such
substances and in any desired colour, and are then subjected to a blast of or are
ground with sand, emery or other hard granular substance, or have imparted to them
a dull, dead, or frosted appearance or condition by etching, effected by dipping
the plates or sheets into hydro-fluoric acid or hydro-chloric acid. The said
plates or sheets are then washed with water, after which the tablets are ready
for use.

page_text: In order to provide a still more perfect writing surface, the plates after being
enamelled may be coated with a thin layer of a molten mass or frit such as is
produced in glass works, this layer of glass being subsequently subjected to the
action of a blast of sand. Furthermore the durability of the tablets may be
increased by the use of perforated plates the holes in which are filled up with
enamel in the enamelling operation, whereby the two enamelled writing surfaces are
connected together.
The plates may also, prior to the enamelling operation, be provided by stamping
with a suitable border so as to render a special frame unnecessary.
Writing tablets such as described have the advantages as compared with the slates
heretofore used of unbreakability and lightness.
They may be employed for many purposes, as they can be written upon, according
to the colour of the tablets, with either slate pencil, lead pencil, coloured pencils,
charcoal, chalk or other substances, and the writing can be readily and easily rubbed
out without leaving any traces behind.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed I declare that what I
claim is :-
1. A writing tablet of metal coated with enamel and having imparted thereto a
dull dead or frosted appearance or condition substantially as described for the
purpose set forth.
2. The manufacture in the manner hereinabove described of the writing tablets
such as referred to in Claim 1, that is to say by enamelling iron, copper, brass or
like plates or sheets of metal formed or cut to definite sizes, and imparting thereto
by grinding, sand blast or etching, a dull dead or frosted appearance or condition,
and subsequently washing.
3. The modification in the manufacture of writing tablets, which consists in
coating a plate that has been enamelled as referred to in Claim 2, with a thin layer
of glass to which a dull surface is subsequently imparted, for the purpose of obtaining
a finer writing surface as described.
Dated this 7th day of December 1901
H. C. REINHOLD,
By L. W., per F. B.