An Invention for applying Black Glass Ground on One or Both Sides as a Substitute for Slate, Wood, and Ordinary Glass as used for "Black-boards" and Notice Boards for Scholastic and similar purposes.
Year: 1898

page_text: An Invention for applying Black Glass Ground on One or Both
Sides as a Substitute for Slate, Wood, and Ordinary Glass as
used for "Black-boards" and Notice Boards for Scholastic and
similar purposes.
I, THOMAS PARR, of 18A & 20, Gt. Eastern Street, London, E.C., Glass
Merchant, &c., do hereby declare the nature of this invention to be as
follows:-
An invention for applying black glass ground on one or both sides as a substitute
for slate, wood, & ordinary glass as used for "blackboards" & notice boards for
scholastic & similar purposes. At the present time the materials commonly used
for "blackboards" & notice boards are slate, wood painted or enamelled black, &
glass of the ordinary colour; the latter is painted black on one side & is only used
on the unpainted side for writing upon. In substituting black glass the advantages
are that a more dense black is produced, no painting or enamelling is required &
the glass can be used on both sides.
An Invention for applying Black Glass Ground on One or Both
Sides as a Substitute for Slate, Wood, and Ordinary Glass as
used for "Black-boards" and Notice Boards for Scholastic and
similar purposes.
I, THOMAS PARR, of 18A and 20, Great Eastern Street, in the County of London,
Glass Merchant, 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 relates to an improved manufacture of glass employed for black-
boards and notice-boards for scholastic and other purposes.
Black-boards as hitherto usually made have been constructed of slate or wood
painted or enamelled black or of ordinary glass. Such glass boards are painted upon
one side and can only be written upon on the unpainted side.
Now, according to this invention I so manufacture glass boards of this description
that they can be used for writing upon on both sides thereof.
In carrying out the invention I make use of sheet or plate glass coloured black
in the manufacture (preferably dense black) and ground upon both sides, the said

page_text: glass being suitably mounted in a frame of ordinary construction and adapted to the
purpose for which the board is to be used.
With glass boards manufactured by my improved method it will be obvious that I
effect a saving of space as the said board can be used upon both sides thereby com-
bining the advantages of the ordinary black-board with those of the glass board. It
will of course be understood that where the board is required to be used on one side
only, the glass is only ground upon that side.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
2..
The manufacture and use of black-boards and notice-boards for scholastic and
other purposes, such boards being formed of sheet or plate glass coloured black
and ground upon one or both sides, substantially as hereinbefore described.
Dated the 27th day of 0.
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicant.