An Improved Drawing Instrument, especially applicable for use in Setting-out Angles in Model Drawing.
Year: 1890

page_text: Date of Application, 16th Sept., 1890
Complete Specification Left, 29th Oct., 1890-Accepted, 29th Nov., 1890
PROVISIONAL SPECIFICATION.
An Improved Drawing Instrument, especially applicable for use in
Setting-out Angles in Model Drawing.
I, JOSEPH KELLETT of 18, St. Mary's Road, Laisterdyke, near Bradford, in the
County of York, Schoolmaster, do hereby declare the nature of this invention to be
as follows:-
The instrument consists mainly of two flat strips of metal, ivory, wood, or other
suitable material. I will suppose the instrument is to be made of sheet metal.
Two narrow strips of the metal, of equal length, are cut out, one having a lateral
extension or abutment at one end. The plain strip is laid with one end over the
projecting part of the other strip and bent so that the two strips when lying parallel,
with their inner edges close together, shall be as nearly flush as possible. A hole is
now pierced through the overlapping parts at some distance from the ends of the
strips and the two portions are united, for instance, by means of a flat headed screw
pin and flat nut, thus forming an instrument capable of giving angles with true
apices. One or both portions or arms of the instrument may be divided off into
inches or other divisions of measurement, and a needle or other point or points and
pen or pencil may be attached to the said arms, thus adapting the instrument for
forming circles and curves.
In using the instrument for setting out an angle, for instance, the top edge of one
arm is set in a horizontal position and the other arm is opened out until its bottom
edge is adjusted to the angle required to be copied and so that the apex of the angle
formed by the two arms is at the same point as the apex of the angle to be copied.
The angle may now be transferred to paper by placing the instrument thereon and
drawing lines, of the desired length, against the two inner edges of the arms
meeting in the apex near the joint.
Dated this 15th day of Santamber 1890
CROSSLEY & Co.,
72, New Market Street, Bradford, Yorks., Agents.
COMPLETE SPECIFICATION.
An Improved Drawing Instrument, especially applicable for use in
Setting-out Angles in Model Drawing.
I, JOSEPH KELLETT, of 18, St. Mary's Road, Laisterdyke, near Bradford, in the
County of York, Schoolmaster, 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 :-
The instrument consists mainly of two flat strips of metal, ivory, wood, or other
suitable material. I will suppose the instrument is to be made of sheet metal. Two
narrow strips of the metal, of equal length, are cut out, one having a lateral extension
or abutment at one end. The plain strip is laid with one end over the projecting
part of the other strip and bent so that the two strips, when lying parallel with their
inner edges close together, shall be as nearly flush as possible. A hole is now pierced
through the overlapping parts at some distance from the ends of the strips and the
two portions are united, for instance by means of a flat headed screw pin and flat nut,
thus forming an instrument capable of giving angles with true apices. One or hoth

page_text: UT one point of points and pen-or penen may be
attached to the said arms, thus adapting the instrument for forming circles and
curves.
In the accompanying drawings
Fig. 1 is a plan of one form of instrument constructed according to my invention
and
"
Fig. 2 is a back view, thereof.
Fig. 3,is a plan of the instrument closed and
Fig. 4 a side view of Fig. 3.
Fig. 5 shows also in plan, a modification adapted to carry needle and pencil (or pen)
points.
:
A, B, are the two arms of the instrument made of metal cast, or stamped out, or of
vulcanite, ivory, wood or other suitable material and one or both of which may
be divided off into inches or other divisions of measurement; and the arm A is
preferably extended so as to form a handle a. The examples on the drawings show
the way I prefer to unite these two arms, viz. by forming the arm A with the lateral
extension or abutment A¹ and the arm B with the flange B', so that when the said
flange is over the lateral extension A¹ the latter lies flush with the arm B. A hole is
now pierced through the part A' and a pin a', screw threaded or not, is rivetted
therein, a similar hole being drilled in the part B', the pin a' is passed therethrough
and the two arms are made fast by rivetting, or by a flat screw nut, or a winged
thumbnut (as in Fig. 5). So far the instrument is of the form shown in Figs. 1 to 4.
In Fig. 5 I have shown the invention adapted to receive a needle point and a
pencil (or pen might be substituted for pencil) thus converting the instrument into a
compass for describing circles and segments of circles. The continuation of the
arm A forming the handle a2 is here rounded, for the easier manipulation of the
compass. The other end of the arm A has a screw threaded pin a³ rivetted thereto
(or a square or other headed countersunk pin may be employed instead) and provided
with a milled or other screw-nut at for clamping the needle C tightly in a channel or
groove as formed in the said arm. The end of the arm B opposite this device also
carries similar screw threaded pin b and nut b¹ which in like manner clamps the
pencil D lying in the groove b².
In using the instrument for setting out an angle for instance, the top edge of one
arm is set in a horizontal position and the other arm is opened out until its bottom
edge is adjusted to the angle required to be copied and so that the apex of the angle
formed by the two arms is at the same point as the apex of the angle to be copied.
The angle may now be transferred to paper by placing the instrument thereon and
drawing lines, of the desired length against the two inner edges of the arms meeting
in the apex near the joint..
The instrument also combines the advantages of a ruler and measure: it may be
used for transferring angles from drawings in carpentry, masonry, perspective, and
the like.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what I
claim is :-
Firstly. The improved arrangement of drawing instrument more especially adapted
for setting out angles, in the manner and substantially as, described and shown on the
drawings with reference to Figs. 1 to 4.
Secondly. The combination of a device, such as that shown and described with
reference to Fig. 5, for describing circles and segments of circles, with the instrument
claimed in the first claim.
Thirdly. The arrangement for clamping or fastening a needle point and a pencil
(or pen) when used in conjunction with my improved form of instrument, as first
claimed, substantially as described and shown.

page_text: Fourthly. The peculiar formation of joint A', B' and a' when employed for uniting
the arms A and B of instruments made according to my invention and used for the
purposes described substantially as specified and shown on the drawings.
31+
ليمن
1000
CROSSLEY & Co.,
72, New Market Street, Bradford, Yorkshire, Agents.