AN IMPROVED DRAWING- BOARD, AND SET-SQUARE FOR USE THEREWITH
Year: 1885

page_text: I, JOSEPH KELLETT, of Laisterdyke, Bradford, in the County of York, School-
master, do hereby declare the nature of my invention for "AN IMPROVED DRAWING-
BOARD, AND SET-SQUARE FOR USE THEREWITH," to be as follows:-
My invention relates to a simple and inexpensive form of drawing board, more
especially for use in schools and a special form of set-square for use therewith by
means of which the use of a T square is rendered unnecessary.
To carry out my invention I make use of a rectangular sheet of strong card-
board and by preference to the left hand edge of this cardboard I attach a flat slip
of wood which has parallel edges, and which is fixed parallel with, and close up to,
the edge of the cardboard. The inner edge of this slip of wood is used to place
the edge of the set-square against, so as to draw lines across a sheet of paper or
drawing book placed flat upon the cardboard and if necessary secured by drawing
pins, such lines drawn across the paper or book by means of a pencil passed along
the upper edge of the set-square will be at a right angle with the parallel edges of
the slip of wood and also parallel with the top and bottom edges of the sheet of
cardboard.
The lower edge of the set-square is not parallel with the top edge thereof but
tapers off, so as to give a broad edge to work against the slip of wood, square
with the top edge along which lines are drawn, and a narrower edge at the side
opposite to what may be termed the working base, thereby forming a trapezoid.
The top edge of the set square is by preference graduated or divided into inches
or other convenient parts.
The slip of wood hereinbefore referred to is not necessarily fixed permanently to
the cardboard but may be attached thereto by thumbscrews in such manner that
by loosing the screws and slightly raising the slip of wood the edge of the sheet of
paper or book to be drawn upon may be placed under the slip of wood and held
firmly in its place by tightening the thumbscrews.
The corners of the cardboard may if necessary be strengthened by metallic
rivets or thin sheet metal or other corner pieces.

page_text: An Improved Drawing-board and Set Square for Use therewith.
I, JOSEPH KELLETT of Laisterdyke, Bradford in the County of York, School-
master 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 a simple and inexpensive form of drawing-board, more
especially for use in Schools and a special form of set square for use therewith by
means of which the use of a T square is rendered unnecessary.
To carry out my invention I make use of a rectangular sheet of strong card-
board and (by preference) to the left hand edge of this cardboard I attach a flat slip
of wood which has parallel edges, and which is fixed parellel with, and close up to,
the edge of the cardboard. The inner edge of this slip of wood is used to place
the edge of the set square against, so as to draw lines across a sheet of paper or
drawing book placed flat upon the cardboard and if necessary secured by drawing
pins. Such lines drawn across the paper or book by means of a pencil passed along
the upper edge of the set square will be at a right angle with the parallel edges of
the slip of wood and also parallel with the top and bottom edges of the sheet of
cardboard.
The lower edge of the set square is not parallel with the top edge thereof, but
tapers off, so as to give a broad edge to work against the slip of wood, square with
the top edge along which lines are drawn, and a narrower edge at the side opposite
to what may be termed the working base, thereby forming a trapezoid. The top
edge of the set square is by preference graduated or divided into inches or other
convenient parts.
The slip of wood hereinbefore referred to is not necessarily fixed permanently to
the cardboard but may be attached thereto by thumbscrews in such manner that
by loosing the screws and slightly raising the slip of wood the edge of the sheet of
paper or book to be drawn upon may be placed under the slip of wood and held
firmly in its place by tightening the thumbscrews.
The corners of the cardboard may if necessary be strengthened by metallic rivets
or thin sheet metal or other corner pieces.
In order to enable my invention to be fully understood I will proceed to describe
the same with reference to the accompanying drawings in which Figure 1 represents
a plan of the drawing board with the set square placed in position upon it.
Figure 2 a plan of the drawing board and Figure 3 the set square.
The drawing board is represented at A and upon one of the shorter sides of the
board, by preference the left hand side, is fixed the narrow parallel slip of wood C
which may be fixed permanently or by means of thumbscrews D.
To hold the paper firmly which is to be drawn upon, the edge of the paper is
passed under the slip C which will hold it, or when provided with thumb screws the

page_text: edge of the paper after being passed under the slip C. is held fast by tightening
the thumb screws D. The upper edge of the set square B is marked in inches, for
the convenience of drawing objects to scale, and lines drawn along this upper edge
are at a right angle to the slip C.
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:
The drawing board formed of cardboard and having a parallel slip of wood or
other suitable material fixed at one side either permanently or by means of thumb-
screws substantially as described and represented in the accompanying drawing
also the set-square for use therewith, as described and represented.
WM JAS BAKER,
Agent for the Applicant.