New or Improved Apparatus for Use in Making Drawings from Models or other Lineal Objects.
Year: 1899

page_text: Date of Application, 6th Apr., 1899
Complete Specification Left, 30th Jan., 1900-Accepted, 6th Apr., 1900
Date of Application, 6th Apr., 1899
Complete Specification Left, 30th Jan., 1900-Accepted, 6th Apr., 1900
PROVISIONAL SPECIFICATION.
A New or Improved Apparatus for Use in Making Drawings from
Models or other Lineal Objects.
I, DAVID JONES, of Llanelwedd School, Builth, in the County of Brecon,
Schoolmaster, do hereby declare the nature of this invention to be as follows:-
My invention relates to drawing apparatus.
The main object of my said invention is to provide an apparatus by means of
which the accuracy of drawings made by hand and eye from models or other
lineal objects can be mechanically tested; or various lines of the object, or
objects to be drawn can be taken by my improved instrument before the drawing
is commenced and then transferred to the paper or canvas and the drawing
made to correspond with the lines taken.
a
In making an apparatus according to my said invention, I first provide a thin
plate of any convenient length and width,--convenient dimensions for same
being about four inches in length by five eights of an inch in width, and form
for the purpose hereinafter described, in the centre of the width of the plate
narrow longitudinal slot extending from near the top of the plate to within
about one inch of the bottom; This plate forms a stock or handle upon which
I pivot on the top part, two thin plate arms of convenient dimensions, a con-
venient size for the purpose in view being about three inches in length by a
quarter of an inch in breadth; the pivot pins upon which these arms pivot,
pass through the arms and stock so that the former can be folded down on the
latter lengthways of same, or turned up to any desired angle to the sides of the
stock.
The action of the whole is as follows:-Taking it that a hand and eye
drawing of say a block model has been made, and it is desired to test the
accuracy of the drawing by means of my apparatus, the apparatus is held in
the hand, at the lower end of the stock between the eve and the model and
the latter is sighted through the slot in the stock so that a vertical line of the
model coincides with the slot, one arm is then adjusted so that the top of the
arm coincides with another line of the model, and simultaneously if desired
the other arm can be adjusted to another line of the model, then upon applying
the apparatus to the drawing made it will at once shew if the lines taken are
drawn at correct angles.
I further provide on the stock and arms of the apparatus graduated scales,
and in sighting the model the apparent dimensions of same to scale are noted,
and upon applying the apparatus to the drawing it can be seen if the relative
lengths of the vertical and angled lines are drawn correctly; or the relative
engths of various lines of the object or objects to be drawn can be taken before
the drawing is commenced and then transferred to the paper or canvas, the
Irawing being made to correspond with the relative lengths taken.
In making my apparatus I do not limit myself to any particular length of the

page_text: stock and arms, it is obvious I can make same of any desired convenient length
for the purpose in view.
My apparatus may be made of brass, steel, or any other suitable material.
Dated this 5th day of April 1899.
בדזי-- --
JONU
Herbert P. Blake,
Chartered Patent Agent, 70, High Street, Southampton,
Agent for the Applicant,
COMPLETE SPECIFICATION.
A New or Improved Apparatus for Use in Making Drawings from
Models or other Lineal Objects.
یشود
I, DAVID JONES, Headmaster, Llanelwedd School,, Builth, Breconshire, 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:-
"
For the purposes of this invention a stock A is made of' suitable dimensions
to which are pivoted two arms B and C of suitable length. These two arms are
pivoted at the same end one-quarter of an inch apart, and on the same surface
of the stock and are to move in the same plane as that surface.
A convenient length for the stock A will be 34 inches, width /16 inches,
thickness inch. The arms B and C are made 4 inches long and ½ inch
wide and 16 inch thick.
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A slot is made in the stock 216 inches long and 3/32 inches wide. It
is made ½ inch from the end to which the arms are pivoted and extends through
the middle of the stock within 1 inch of the other end.
A scale of marks is shown on the surface of the stock A and arms B and C
and numbered consecutively from 1 to 5. Those marks are ½ inch apart.
The arms B and C are fastened to the stock A by means of a rivet or thumb-
screw and is so adjusted that the arms B and C when manipulated will stay
in any position, at the same time friction is reduced to a minimum.
The method of using this invention is as follows:-The stock A. is' held in
one hand and the observer looks. through the slot D on the perpendicular (nearest
to him) of any model, this perpendicular either to be shown, drawn, or made by any
artificial means, the right arm B is then moved by the other hand, so that its
upper side seems to coincide with the right line, i.e. the line shewing where two
planes of the model or object meet.
In a similar manner the left arm C is moved so that its upper edge seems to
coincide with the left line, i.e. the line shewing where two planes of the model
or object meet.
Then the scale of marks is noticed.
The perpendicular length of the model or object by means of the stock A, the
length of the right line by means of the arm B, and the length of the left line
by means of the arm C.
Now the drawing made is tested by this apparatus, the slot D is placed on
the perpendicular line and then it is seen by the aid of the arms B and C
whether the right and left arms are drawn at a correct angle as seen from the
position of the observer, also the length of, the lines is tested by means of the
scale of marks and seen if they are drawn in proper proportion to one another.

page_text: The arm B will move along a path as shown by dotted line from E to F or
vice versa from F to E.
The arm C will move along a path as shown by dotted line from G to H or
vice versa from H to G.
.
It is obvious that for the purpose of this invention it may be manufactured
in any metal such as iron, steel or brass or any other material such as wood or
xylonite.
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
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The stock and arms herein mentioned form a perspective plane.