An Improvement in Parallel Rulers.
Year: 1897

page_text: Date of Application, 29th Sept., 1897-Accepted, 30th Oct., 1897
COMPLETE SPECIFICATION
An Improvement in Parallel Rulers.
I, JAMES HAYDON STONE The Workhouse Flax Bourton Nr. Bristol Master
of Bedminster Workhouse 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 is an attachment to the ordinary parallel ruler by which the required
spaces between the lines to be drawn can be read and measured as the work
progresses without the aid of any other measuring instrument whatever and
which I here describe as the straight edge and the measure rule.
The straight edge is a narrow plate of metal preferably, fixed to either of the
halves of the parallel ruler with a space between it and the ruler, sufficient
to admit of the measure rule passing freely to and fro. The measure rule is
a plate of metal with measurements cut on the face of it, and can be fixed to
either of the halves of the ruler. When the straight edge is fixed to the lower
half, the measure rule is fixed to the upper half, and as the parallel ruler is
open or closed the measure rule moves with it, between the parallel ruler and
the straight edge, and the required space lines can be read and drawn on the
paper as at M. Figure 2. When the straight edge is fixed to the upper half,
the measure rule is fixed to the lower half, and on opening or closing the parallel
ruler, the straight edge moves over the face of the measure rule, and the lines
are read and drawn accordingly.
The attachments can be fixed in any position on the face of the parallel ruler;
in the middle or at either end as shown in Figures 1. 2. 3. 4. 5. 6.
EXPLANATION OF DRAWINGS.
The lettering is the same, as far as they go, in all the figures.
A is the upper half of the parallel ruler. B the lower half. C the parallel
joints connecting the two halves. D the straight edge. E the measure rule,
cut to any measurements. In the drawings the measurements are eighths and
sixteenths of an inch. F in Figures 1-2 is a small screw head with pin which
fits a small hole in ruler and keeps the measure rule in position as shown in
Figure 1. G is a similar screw and pin which keeps the measure rule in position
as shown in Figure 2. H is a stud which determines the position of the measure
rule, when the rulers are closed and not required for use. K is a similar stud at
the end of straight edge which determines the position of the measure rule when
ready for work. H. K. are not required in Figures 3. 4. 5. 6. as the measure
rule is fixed by small screws. L are the studs for holding the lower half to the
paper, and moving the upper half to the required position on the measure rule.
Figure 2. shows the measure rule at work. We will suppose Figure 2. to be
closed. Eight lines have to be drawn on the paper from the base M (which
would be the position of the upper edge of ruler if closed) with spaces between
each as follows,1,1,1,1,1, the first four lines have been drawn in
their proper position at the left hand upper corner, and the measure rule has
been raisedths and carried to the right in a perpendicular position 18 ths.
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page_text: The operator has merely to keep his eye on the straight edge, and as the
measure required comes into position, draw the line. The measure rule need not
be longer than the space between A and B when C is in a perpendicular position.
In Figures 3. 4. the straight edge is on the lower half, and the measure rule
moves under it. In Figures 5. 6. the measure rule is fixed to lower half and
the straight edge moves over the face of it.
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:-
-
1. The straight edge and measure rule attachments to any and every descrip-
tion of parallel ruler or rulers.
2. The positions, and method of fixing the same as above described in this
'specification, and as shown in Drawings. Figures 1. 2. 3. 4. 5. 6.
•
Dated this 27th day of September 1897.
JAMES HAYDON STONE,
The Workhouse, Flax Bourton, Nr. Bristol.