New or Improved Curvolineograph, or Instrument for. Delineating Curves of the Link Motion and other Curves.
Year: 1893

page_text: Date of Application, 26th Jan., 1893
Complete Specification Left, 26th Oct., 1893-Accepted, 30th Dec., 1893
PROVISIONAL SPECIFICATION.
A. New or Improved Curvolineograph, or Instrument for. Delineating
Curves of the Link Motion and other Curves.
We, WILLIAM BRENNAND, of The Fort, Milverton, in the County of Somerset-
hire, Gentleman, and WILLIAM ERNEST BRENNAND, of Bradbourne Thorpe,
Bournemouth, in the County of Hampshire, Solicitor, do hereby declare the nature
of this invention to be as follows :-
Our invention refers to a curvolineograph or instrument for delineating curves,
and the principal objects of our invention are to construct an instrument or device
whereby the curves of the link motion may be drawn and demonstrated (hitherto
unaccomplished except by special means adapted to isolated cases); to produce
curves which may be reduced into classified orders and rendered intelligible and
capable of comparison one with another; to so construct the instrument or device,.
that the positions of the various parts thereof and consequently the formation of
the resulting curve may be governed by a definite unit of measurement, a unit
moreover adjustable to the metrical system of any country, and based on the.
decimal system, whereby calculations on the subject are facilitated.
According to our invention the device is composed in its simple or elementary
form of three bars of wood, metal, vulcanite, gelatine, or other suitable material.
These bars are arranged so that there are two lateral bars, which for clearness
of description we will distinguish by the letters rand, while the third (distinguished
by the letter L) connects the two lateral bars r¹ and
The middle bar L is perforated, having 21 holes formed therein, dividing the
whole length into 20 equal parts (or having so many holes therein as shall divide
the same into equal parts, such that each part shall be two tenths of the whole line,
or shall be a decimal of such two tenths), the hole at each extremity receiving a
joint pin which passes through holes formed in the lateral bars r¹ and ³, these
latter bars being likewise perforated throughout their lengths with holes the same
distance apart as the holes in the bar L. The joints between the bar L and bars
and may be formed by rivets, or by nuts and screws (if the bar L is required to
be removable), or other suitable or well known forms of joints may be employed.
The lengths of the bars may be varied as desired, always provided that there are
21 holes (or such holes as aforesaid) in the bar L, and that the holes in the lateral
bars and are the same distance apart as the holes in the said bar L.
Two points or vertical pins carried by bars or formed by bars, say for example,
baving turned up ends, are provided, and these points or pins are adapted to pass
through any one of the holes of each lateral bar, the said points being so carried
by the point-carrying bars sliding in fixed sockets or equivalent devices, that the
said points may be caused to approach or recede from one another in a right line;
the sockets are preferably provided with flanges or other, means of fixture for
attachment to, say, an ordinary drawing board. The point-carrying bars are
also provided with perforations through which drawing pins may be put, fixing the
bars to the board without or with the addition of the sockets,
When the device is in position, the lateral bars are free to turn on their
respective fixed points; a pencil point, stylographic pen, or tracer is inserted in one
of the holes, for example, of the bar L, and upon imparting motion to it, the pencil
point will describe the curve and shew to the operator the exact path taken by the
point.
The bar L'may be made removable and be changed when desired for bars or'
links graduated differently or with intermediate perforations, and when desired we

page_text: may substitute, instead of a straight link L, other links or plates of different forms,
in which perforations are made, 21 holes (or such holes as aforesaid) being
perforated along a line corresponding with the link L, and having other
perforations thereon bearing a certain relation, as to position, with the central hole
in that line, or with the pivot joints at the extremity of it, connected with the
lateral bars; such links or plates may be triangular, T shaped, semicircular,
or otherwise, and be suitably perforated.
It will be obvious that when required we may employ a combination of more than
three perforated bars or bars and plates.
Dated this 26th day of January 1893.
WILLIAM BRENNAND.
WILLIAM ERNEST BRENNAND.
Brewer & Son,
London and Leeds, Agents.
COMPLETE SPECIFICATION.
A New or Improved Curvolineograph, or Instrument for Delineating
Curves of the Link Motion and other Curves.
We, WILLIAM BRENNAND, of The Fort, Milverton, in the County of
Somersetshire, Gentleman, and WILLIAM ERNEST BRENNAND of Bradbourne
Thorpe, Bournemouth in the County of Hampshire, Solicitor, 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 :-
Our invention refers to a curvolineograph or linkograph, or instrument for
delineating curves, and the principal objects of our invention are, to construct an
instrument or device whereby the curves of any link motion may be drawn and
demonstrated, and may be reduced into classified orders, and rendered intelligible,
and capable of comparison one with another; to so construct the instrument or
device, that the positions of the various parts thereof and consequently the
formation of the resulting curve may be governed by a definite unit of measure-
ment, a unit moreover adjustable to the metrical system of any country, and based'
on the decimal system whereby calculations on the subject are facilitated.
.
In the drawings-
Figure 1 is a perspective view of a curvolineograph or linkograph instrument
for delineating curves shewn applied to a drawing board.
Figure 2 is a detached view of a traversing bar.
Figure 3 is a plan, and Figure 4,is a sectional side elevation of carrying and
sliding devices for applying the instrument to a drawing board.
Figures 5, 6, 7, 8, 9, 10, 11 and 12 shew various forms of links to be used with
the instrument and hereafter referred to.
According to our invention the device or instrument is composed in its simple or
elementary form, of three bars moving upon pivots and made of wood, metal,
vulcanite, gelatine, or other suitable material.
The detailed description is as follows:
Firstly. Two points or vertical pins O¹ 0* soldered or otherwise fixed at the
ends of bars (or formed by bars, say for example, having turned up ends) are
provided. Each of such bars carrying its point or pin is made capable of sliding
in fixed sockets, grooves, or equivalent devices, so that the said points or pin
ends O'O may be caused to approach or recede from one another in a right line
and may be fixed by means of screws at any assignable distance from each other
according to a given number of units of measurement (such units being hereinafter
described) the distance between the points or pins being represented by the
symbol 2 d (d¹ + ď³).
The sockets are preferably provided with flanges or other means of fixture for
J

page_text: attachment to say, an ordinary drawing board. The point carrying bars may be
provided with perforations, through which drawing pins may be passed into the
board and the bars thus held with or without the sockets. Fig. 3 is a plan and
Fig. 4 is a sectional side elevation of these bars and carrying and sliding devices,
Fig. 3 being shewn detached from the drawing board.
Secondly. The device further consists of two bars and each of which is
perforated throughout its length with holes placed at equal distances apart forming
a series of divisions of equal length. Such distances or divisions are made
according to the unit of length hereinafter described. Moreover the said holes
are such that they shall accurately fit the points or pins or pivots O' O' hereinafter
described, so that when the holes in the bars and are slipped over the points
or pins O'O' those bars may be free to turn upon the pivots at any assignable
division of and 7.
Thirdly. The device further consists of a traversing bar A B (or 21) jointed at
each extremity with the lateral bars and r². The bar A B (or 21) (shewn
detached at Fig. 2) is also perforated, having 21 holes (as shewn) formed therein,
dividing its whole length into 20 equal parts. The hole at each extremity receives
the joint pin A or B which passes through the hole formed at the extremity of the
lateral bar or ². The bar A B (or 21) may be of any convenient length; but
whatever be the length adopted, we divide the distance between the joints or pins
at each extremity into 20 equal parts, each of such parts being the unit of
measurement governing the use of the instrument and the scale of delineation of
curves constructed by it. The half of the whole distance .e. 10 units, we
denominate by the symbol which is constant.
The three bars ²² and 27 we call the triple bar.
The joints between the bar A B and bars may be formed by rivets, nuts and
screws (if the bar A B is required to be removable) or other suitable or well
known forms of joints may be employed.
When the device is in position, the lateral bars are free to turn on their
respective fixed points and a pencil point, stylographic pen, or tracer P is inserted
in one of the holes, for example, of the bar A. B, and upon imparting motion to it
the pencil point will describe the curve and shew to the operator the exact path
taken by the point, such a curve being shewn on the drawing board, Fig. 1.
The bar A B or 21, may be made removable and be changed when desired for
bars or links graduated with intermediate perforations and when desired we may
substitute instead of a straight link other links or plates of different forms in
which, in addition to the 21 holes perforated along a line corresponding with
the link A B other perforations are made therein bearing a certain relation as to
distance and position with and from the joints A and B or the central hole M
between them. The link Fig. 2 is the ordinary straight bar along which P the
tracer varies in the line joining A B.
The links Figs. 5 and 6 are variations whereby P may be placed along any line
perpendicular to the divisional points on A B or A B produced.
The plate link Fig. 7 is in the circular form whereby (regarding one semi-circle),
P may be placed along lines making certain angles with A B or A B produced at
either of the points A B or M and (regarding the other semi-circle) P may be
placed along lines making certain other angles with A B or A. B produced at either
of the same points.
The plate links Figs. 8, 9, 10, 11 and 12 are other forms which may be substituted
for those described and in which the perforations are in various positions in relation
to A B or M respectively. Figure 12 is another form of link being rectangular
in shape, and may be extended in various sizes, a portion of the link only being
shewn at the aforesaid Fig. 12; the perforations are at intersections of horizontal
and perpendicular lines say 16 of an inch apart.
It will be observed that when a curve is drawn, wherever P, the tracer, may be
situated, its position may be defined for the most part in settled terms of the units
hereinbefore described.

page_text: In every case the unit adopted i.e. one tenth of or one twentieth of 21
(whatever may be) will govern the scale or size of the curve drawn, the form
being similar whether the scale be large or small.
By our invention―
1st. A definite means (by the socket and screw) is obtained of adjusting and
fixing the points O' and O' at any required distance from each other according to
'the unit scale of 1.
2nd. A definite means (by insertion of pivot in regulated holes) of adjusting the
bars and at any required distance between 21 and O' or O' according to the same
unit scale of 1.
3rd. A definite means of regulating the curvolineature by the insertion of a
tracing point along 21 according to the same unit scale of 1.
4th. A definite means of indicating the position of the tracer on the additional
forms of 2 represented in the figures which are constructed according to the same
unit scale of 1.
5th. The unit scale of itself, an invention by which the whole of the curves
described by the instrument may be reduced into classified orders, and rendered
intelligible and capable of comparison one with another; a unit moreover adjustable
to the metrical system of any country, and being based on the decimal system,
rendering calculations on the subject, easy.
6th. The instrument is particularly intended for the drawing and demonstration
of the curves of the link motion, hitherto unaccomplished except by special means
adapted to isolated curves.
The instrument draws and demonstrates curves dependent ou the linkage of
3 bars, although a greater number of bars or plates may be added if required.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed we declare that what we
claim is:
1. An instrument composed of three bars, one bar 2 l divided and pierced with
21 holes, two bars pivotted by their ends to the end holes of the bar 21, and
two sliding bars carrying points O'O' upon which points the bars pivot, all the
bars being pierced or divided according to a definite and common unit of measure
ment, so that upon a pencil point being inserted through one of the holes of the
bar 21, and the bar moved, a curve will be traced that is governed by a definite
unit of measurement and is capable of mathematical comparison with other curves
resulting from a changed position of the tracing point or pencil as set forth.
2. In instruments for delineating curves capable of classification, the combination
of a bar 2 formed with 21 perforations with two bars, each jointed at one end
by pins A and B to the end perforations of bar 2 1, perforations formed in bars ² yo
at the same pitch as the perforations of bar 21, two bars sliding in fixed sockets,
each sliding bar carrying points O'O' upon which bars pivot, the pivot points
being thereby capable of being distanced from one another, the fixed sockets being
located opposite to one another, and held to a board or foundation by screws, as
set forth.
3. In instruments for delineating curves, capable of classification, the combination
with two bars r perforated at an equal pitch, two sliding bars carrying points or
vertical pins O'0', upon which points O' O the bars r pivot, and fixed sockets
wherein the said point-carrying bars slide, of a reticulated plate or T shaped link
(Figs. 5 and 6), jointed at the extremities of its base to the ends of bars ¹³, and
perforated at a pitch equal thereto, as set forth.
4. In instruments for delineating curves capable of classification, the combination
with two bars perforated at an equal pitch, two sliding bars carrying points or
vertical pins 0¹0 upon which points O'O' the bars pivot, and fixed sockets
wherein the said point-carrying bars slide, of a circular shaped piece (Fig. 7)
jointed to the ends of the bars and perforated at a pitch equal thereto; as
set forth.

page_text: 5. In instruments for delineating curves capable of classification, the combination
with two bars perforated at an equal pitch, two sliding bars carrying points or
vertical pins 0 0, upon which points O'O' the bars pivot, and fixed sockets
wherein the said point-carrying bars slide, of plates (Figs. 8, 9, 10, 11 and 12)
5 perforated at a like pitch, as set forth.
Dated this 25th day of October 1893.
BREWER & SON,
London and Leeds, Agents for Applicants.