A New and Improved Combined Centrolinead and T Square for Architects, Artists, Draughtsmen, and Others.
Year: 1898

page_text: Date of Application, 29th Oct., 1898
Complete Specification Left, 29th July, 1899-Accepted, 14th Oct.,
1899
PROVISIONAL SPECIFICATION.
A New and Improved Combined Centrolinead and T Square for
Architects, Artists, Draughtsmen, and Others.
I, BENJAMIN HIBBERT, Artist, 260, North End Road, Fulham, S.W., London;
do hereby declare the nature of this invention to be as follows:
Two straight arms joined on a pin, or rivet, so that they may be adjusted, from
being in a straight line, to any desired angle. These armis are adjusted by two
short arms, one end of each fixed to the long arms, and the other ends fixed to
a slide that works on a guage or scaled bar. One end of this bar is fixed to the
aforesaid pin or revet, that connects the long arms, and is at right angles to them
when they form a straight line, so that, when this bar is fixed parallel to the edge
of the straight edge or T square, and the long arms cross the edge at right angles,
they can be used as a T square, and when the arms are set at angles, they can
be used as centrolinead. These said arms work against two or more points, fixed
to, but not on the face of the drawing board, table, or the like. The whole
apparatus is attached to the T square or straight edge by means of revolving
clips or the like to allow the apparatus to be used for right or left vanishing
lines. It can also be made with fixed clips, or, permanently affixed to a straight
edge. The aforementioned clips can be tightened by means of a screw or other
suitable method.
.
This invention can be made of aluminium, brass, or any suitable metal or
wood, or both combined.
A New and Improved Combined Centrolinead and T Square for
Architects, Artists, Draughtsmen, and Others.
BENJAMIN HIBBERT, 19, Lillyville Road, Fulham Road, London, S.W., late
of 260, North End Road, Fulham, S.W., 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 instrument consist of three parts. A straightedge about 3 or 4 feet long.
The centrolinead, and the two points attached to but not on the face of the
drawing board.
The straightedge a Fig. 1 can be made of any suitable wood or metal, and
can be of any desired length. The centrolinead is preferably made of metal
such as brass, electrum or it can be made of metal & hard wood combined.
It has two long straight arms joined similiar to an ordinary rule, “by, means
031

page_text: of a pin or screw, Fig. 2 B, from this joint is a short bar Fig. 2 C, at right
angles to the long arms when they are in a straight line Figs. 1 & 2 D, d, this
short bar carries a sliding nut with projecting ears on either side Fig. 2 E, to
which are attached, by means of screws or rivetts, two short arms or links Fig. 2 F
connecting again with the long arms about 4 inches from the joint B Fig. 2,
thus, each long arm will be compelled to move together and at similar angles.
On the short bar Fig. 2, C between the slide and the rule joint is a fixed stop
with large ears on either side Fig. 2 G preventing the long arms getting beyond
a straight line d, D, Fig. 1 & 2, and providing a means of attaching the afore-
mentioned straightedge A Fig. 1-by a thumb screw fitting into the two holes
in the stop G Fig. 2. There are holes provided in the straightedge for the thumb
screw to pass through, 6 Fig: 1. At each end of the short bar C C Fig. 2 is a rest
or chair H H Fig. 2 to carry the straightedge, they are flat pieces of metal and
have a ridge across to keep the straightedge exactly in position over the centre
of the instrument and in a line with the short bar. These rests or the like can
be turned round so that the instrument will serve either right or left hand, one
of the rests turns on the pin or screw B Fig. 2, that forms the joint of the long
arms and the short bar, the other rest is secured and turns around in a like manner.
Also on the short bar C C, Fig. 2 between the slide and the outer rest is a sliding
gauge nut that can be fixed where required by a small thumb screw J J Fig. 2
provided for that purpose, this sliding gauge nut fixes the distance the slide E
Fig. 2 can work, thus, govening the angles of the long arms.
The points Fig. 3. These points are constructed similarly to a box knuckle
hinge, and are fastened on the table, board, or the like, by means of drawing
pins through holes in the hinge plate K, Fig. 3, this plate is hinged so that
any strain will not lift out the pins as would be the case if the points were in
one piece, it also allows the points to be turned over on the face of the board
when not in use, this plate is hinged to the pointed portion or end of point which
hangs from the hinge joint at right angles on the edge of the board or the like
LL Fig. 3 and then projects outwards about 6 inches a little below the surface
of the board, this portion of the point is bent angle-wise the full length to give
strength to carry the centrolinead. At the end of the point are two short
pegs M M Fig. 3, about one inch apart, the long arms of the centrolinead works
in between these pegs, thus, by pressing the instrument outwards or away from
the board the long arms take a straight line D d Fig. 1 & 2 and act as a T sq.,
and when the instrument is pulled inwards against the inner pegs the long arms
take or form an angle and thus provide a means of drawing lines that would
meet at a point any desired distance away from the board.
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:
An instrument for drawing the vanishing and (with the aid of a set square
vertical lines of a perspective drawing characterized by a straightedge of wood
or metal of any suitable length, by two long movable arms, by two short arms
or links joined on a sliding nut also on to the long arms, compelling them to
both move at the same time and angle, by a short bar on which the aforemen-
tioned sliding nut works, by a movable and a fixed stop, by two rests or chairs
that can be turned round to carry the aforementioned straightedge for either
right or left hand, by two projecting hinge points with two small pegs at the
ends between which the above described instrument works as shewn on the made
for that purpose.
·ות
001
1
PT 1
1000
BENJAMIN HIBBERT.