Improvements in Instruments for Drawing Straight or Curved Dotted or Broken Lines.
Year: 1896

page_text: PROVISIONAL SPECIFICATION.
Improvements in Instruments for Drawing Straight or Curved
Dotted or Broken Lines.
FREDERICK RICHARD SLACK Engineer 23 Molineux Street Derby do hereby
declare the nature of this invention to be as follows:-
My invention consists of a thin sheet of steel, or other suitable material,
perforated with straight or curved rows of rectangular, or other shaped holes.
The width of each hole and their distance apart, are respectively equal to the
length of each line and space making up the dotted or broken line.
To draw the dotted or broken lines, the sheet is placed over that part of the
drawing where such dotted or broken lines are required, and an ordinary drawing
pencil, pen, or compass, is passed over the perforations. The bars prevent the pen,
pencil, or compass, as it is drawn across the perforations, from touching the paper
except at fixed points, and a broken or dotted line is produced.
Dated thin th of tabou 190
FREDERICK RICHARD SLACK.
Improvements in Instruments for Drawing Straight or Curved
Dotted or Broken Lines.
I, FREDERICK RICHARD SLACK of 23 Molinenux Street, Derby in the County
of Derby, Mechanical Engineer, 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:-
In describing my invention reference will be had to the accompanying sheet of
drawings:-
Figures 1, 2 and 3 being plans of strips of metal or other suitable substance
perforated as hereinafter explained.
Figure 4 is an elevation of the same and Figure 5 is a plan of a curved piece of
perforated metal or the like as hereinafter described.
My invention consists of employing a thin sheet A of metal or other suitable
substance perforated with rows of curved, straight or other shaped openings or
holes, the widths of the holes and their distances apart being respectively equal
to the lengths of the portions of the dotted line and the spaces between. To
draw the dotted or broken line, the perforated sheet or strip is placed over that
part of the drawing where such dotted or broken line is required and an ordinary
drawing pencil, pen or compass is passed over the perforations; the bars prevent
the pencil, pen or compass as it is drawn across the perforations from touching the
paper or the like except where the said perforations occur, and a dotted or broken
fine is produced.

page_text: A tab B may be affixed to each strip or sheet for convenience in adjusting or
handling it and it will be readily understood that any desired arrangement
of perforations and intermediato bars may be formed according as a plain dotted
or chain line or other form of broken line is required as shown at C, D, and E,
Figure 3.
The said perforations or slots may also be made to radiate from a centre as
shewn on Figure 5 to ensure the portions of a broken line being of an equal or
approximately equal length when drawn with the compasses.
The sheets may be of any required size as indicated by broken lines on
Figure 2 for convenience in making dotted or broken lines around any irregularly
shaped figure.
Having now particularly described and ascertained the nature of my enid inven-
tion and in what manner the same is to be performed I declare that what I
claim is:-
The improved instrument for use in drawing straight or curved dotted or broken
lines consisting of a thin piece of perforated metal or other suitable substance or
composition, with tab B or its equivalent, adapted for use in combination with
an ordinary pencil, pen, drawing pen or compass, substantially as described and
illustrated.
Calca this 20th day of November 1906
W. SWINDELL,
Imperial Chambers, Albert Street, Derby, Agent for the Applicant.
W. SWINDELL,
Imperial Chambers, Albert Street, Derby, Agent for the Applicant.