IMPROVEMENTS IN SLATES
Year: 1885

page_text: I, FRITZ MÜLLER, of Solingen in the Rhenish Province, Empire of Germany
do hereby declare the nature of said invention for IMPROVEMENTS IN SLATES
to be as follows:-
This invention relates to a contrivance at the frame of the slate, for providing
the surface of the slate, in a simple manner and without particular skill, with
uniform lines.
This contrivance dispenses with colour lined slates, that are so detrimental to the
eye. This slate, only ruled when used, can be employed for other purposes, as
reckoning, drawing etc.
The frame of the slate is provided with notches, cut in or put on, the projecting
edges of which are used as supports for a rule to be laid against them.
Those notches may be cut out directly from the wood of the slate-frame, or tin-
plates provided with notches may be fixed to a plain wooden frame.
The notches may be replaced by any projecting elevations, as pins, small balls
etc., answering the same purpose, and containing the same principle.
It will be useful to put the notches or elevations as close as possible to each other
to enable the slate-surface to be ruled to any desired width.
The notches or elevations may be applied to two sides or to all sides of the slate-
frame, so as to enable to form by crosswise ruling rectangles and squares.
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page_text: I, FRITZ MÜLLER, of Solingen, in the Rhenish Province, Empire of Germany,
do hereby declare the nature of my invention for IMPROVEMENTS IN SLATES, 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 a contrivance at the frame of the slate, for providing 5
the surface of the slate in a simple manner and without particular skill with
-uniform lines.
This contrivance dispenses perfectly with colored liues on slates, that are so
detrimental to the-eye. This slate, only ruled,-when used, can be employed for
other purposes, such as reckoning, drawing etc.
i
The annexed drawing represents this contrivance in two different forms.
The frame of the slate a is provided with notches b, arranged in pairs, the
projecting edges of which are used as supports or abutments for a rule c or d, to bo
laid against them.
1
Figs. 1 and 3 represent those notches b, cut out directly from the wood of the 1
slate frame. Figs. 2 and 4 show metal plates e, provided with notches and fixed to
& plain wooden frame.
The notches may be replaced by projecting elevations, such as pins, small balls
etc, answering the same purpose and containing the same principle.
It will be useful to put the notches, recesses or elevations as close as possible to 2
each other, in order to enable the slate surface to be ruled to any desired width.
The notches or elevations b may be applied to two sides or to all sides of the slate
frame, so as to enable one to form rectangles or squares by crosswise ruling.
Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed, I declare that what?
I claim is
A slate frame, having notches or recesses b, cut into the frame, or applied to the
same, or corresponding projections, adapted to afford a series of rests for a rule,
substantially as described and shown, and for the purpose set forth.