AN IMPROVED MACHINE FOR TRACING. OR ENGRAVING FROM SOLID BODIES OR SUBJECTS IN RELIEF
Year: 1847

page_text: TO ALL TO WHOM THESE PRESENTS SHALL COME, I, SAMUEL
STOKES, of Monkwell Street, in the City of London, Carpenter, send greeting.
WHEREAS Her present most Excellent Majesty Queen Victoria, by Her
Letters Patent under the Great Seal of Great Britain, bearing at West-
minster, the Tenth day of July, One thousand eight hundred and forty-seven,
in the eleventh year of Her reign, did, fór Herself, Her heirs and successors,
give and grant unto me, the said Samuel Stokes, my exors, admors, and
assigns, Her especial licence, full power, sole privilége and authority, that
I, the said Samuel Stokes, my exors, admors, and assigns, or such other as
I, the said Samuel Stokes, my exors, admors, or assigns, should at any time
agree with, and no others, from time to time and at all times thereafter during
the term of years therein expressed; should and lawfully might make, use,
exercise, and vend, within England and Wales and the Town of Berwick-
upon-Tweed, my Invention of "AN IMPROVED MACHINE FOR TRACING. OR
ENGRAVING FROM SOLID BODIES OR SUBJECTS IN RELIEF;" in which said Letters
Patent is contained a proviso obliging me, the said Samuel Stokes, by an
instrument in writing under my hand and seal, particularly to describe and
ascertain the nature of my said Invention, and in what manner the same
is to be performed, and to cause the same to be enrolled in Her Majesty's
High Court of Chancery within six calendar months next immediately after
the date of the said recited Letters Patent, as in and by the same, reference
being thereunto had, will more fully and at large appear.
NOW KNOW YE, that in compliance with the said proviso, I, the said

page_text: Samuel Stokes, do hereby declare that the nature of my said Invention
consists in a machine of three parts (that is to say):-
First, a framework or stand fitted with an universal joint and carrying a
long hollow bar..
Second, an apparatus which I call a secting and dividing apparatus
which determines the plane in which what I call the tracing blade is to
move; and,
Third, a sliding rod carrying the tracing blade, and moving in the said
hollow bar, through which bar the line of projection of the instrument is
determined, and which sliding rod is moved by the hand of the operator
against the surface of the solid body or subject in relief, thus producing the
required engraving on a fixed plane opposite to and at a distance from the
tracing blade by means of a diamond point, the motions of which are regulated
by an improved apparatus herein-after described.
And in further compliance with the said proviso, I, the said Samuel Stokes,
do hereby describe the manner in which my said Invention is to be per-
formed by the following statement thereof, reference being had to the Drawing
annexed, and to the figures and letters marked thereon (that is to say):-
DESCRIPTION OF THE DRAWING.
The framework here shewn is made of wood. The base consists of six
pieces of timber of about five inches by three inches scantling, bolted together
in the form of Figure 1, having four pieces fitted and bolted in the mortices
a, a, a, a, as shown in the perspective elevation, Figure 10, and meeting over
the point b, also two pieces from the mortices a', a', meeting over the point
. The four pieces from a, a, a, a, are connected at the top by a transom
to the two pieces from a¹, a¹.
Figure 2 is an elevation of the same. c, Figure 2, is a metal standard fixed
to the transom 62, having an universal joint c¹. d is a drawing board fixed on
the transom b. On the centre of the cross 63, Figure 1, is fixed a hollow metal
prism-shaped standard having its angles planed parallel. Two pieces of wood
are fitted and bolted in the mortice a, a, and joined to the top of the
prism to steady it.
Figure 3 is an elevation of the same.
Figure 4 is a metal puppet made to slide up and down accurately on the
prism 6, Figure 3, having two centres at e, f.
Figure 5 represents two oblique hollow tin cones set on the same base, with
one hollow tin cone on its opposite side carrying a counterpoise. They are
made of tin and hollow in order to be of light weight. At e, f, are two

page_text: פיייע
are two centres to fit Figure 6.
Figure 6 represents two cones on the opposite sides of the same base,
having a counterpoise i at the apex of one, and an universal joint k at the
apex of the other, to fit the collar of Figure 8. The hollow bar before
mentioned, and which I call the projection bar, is a light framework of wood
with stays and tension wires 1, 1, 1, 1, to prevent, as much as possible, "any
vibration.
Figure 7, m, m, are two centres to attach the bar to the universal joint c' in
Figure 2. At n, n, n, n, are four friction rollers to carry the slider or
sliding rod shown at Figure 8. At o is the diamond point which projects
the Figure in the form of an engraving on the copper or other plate fixed.
on the drawing board.. The short end of the projection bar is solid and
loaded with lead to balance it on the centres m, m.
Figure 8 is the, metal slider or sliding rod shown in section with two V
grooves cut in it to receive the friction rollers n, n, n, n, of Figure 7. At ¹ is
a collar to form a part of the universal joint of Figure 6. P, in Figure 8, is-
a revolving pointed rod, which I call the tracing blade, similar to what is. now.
in use for like purposes.
Figure 9 is the apparatus to carry and project the diamond point against
the plate on the drawing board. The dotted lines show. the action of the
apparatus, which is so simple that it requires no further explanation than
what is given by the Figure. w is an eccentric to take the diamond from
the drawing board when required, and is worked by a pulley on the same
axis as the eccentric and band leading to the other end of the apparatus, to be
turned by the operator as occasion requires. When the apparatus is put
together the axis of the puppet e, f, Figure 4, must be inclined to the plane
of the drawing board d, Figure 2, about forty-five degrees. The axis e, f,
must be parallel to g, h, Figure 5,. and g¹, h¹, Figure 6. The axis of the
blade P, the line of motion of the slider Figure 8, the centre of. the universal
joint c' in Figure 7, and the line of motion of the diamond point o, must be
all in one straight line. The centre t, Figure 9, the centre of the roller r,
and the diamond point q, must be at equal distances from the centre s, so
that as the roller r moves in the plane y, the point q. will move in the
straight line t, q. The puppet (Figure 4) is made to move up and down
the prism-formed standard by a wire or chain, one end being fixed. to the
top of the prism-formed standard, the other coiled round a cylinder attached
to the puppet, having a tangent screw with a winch and racket such as is
generally used for such purposes.
Now whereas the parts of this apparatus

page_text: which I conceive constitute it an improved machine for the purpose aforesaid
are,―
First, what I call the hollow projection bar and the supporting of it upon
an universal joint in the frame.
Secondly, the arrangement of cones with centres or axes, universal joints,
and balance weights, and their rising and falling motions on the prism-shaped
standard, all which I call the secting and dividing apparatus. And,
Lastly, the apparatus shown at Figure 9 by which the movement of the
diamond point is effeeted:
And I therefore claim all these parts as of my Invention. And such my
Invention being, to the best of my knowledge and belief, entirely new, and
never before used within that part of Her said Majesty's United Kingdom of
Great Britain and Ireland called England, Her said Dominion of Wales, or
Town of Berwick-upon-Tweed, I do hereby declare this to be my Specification
of the same, and that I do verily believe this my said Specification doth
comply in all respects, fully and without reserve or disguise, with the proviso
in the said herein-before in part recited Letters Patent contained; wherefore I
hereby claim to maintain exclusive right and privilege to.my said Invention.
In witness whereof, I, the said Samuel Stokes, have hereunto set my
hand and seal, the Tenth day of January, in the year of our Lord One
thousand eight hundred and forty-eight.