IMPROVED APPARATUS FOR ENLARGING AND REDUCING BASSO-RELIEVOS, PLANS OR DRAWINGS, AND WRITINGS
Year: 1869

page_text: PROVISIONAL SPECIFICATION left by Henry Edward Newton at the
Office of the Commissioners of Patents, with his Petition, on the
6th May 1869.-A communication from abroad by Edmond Stanislas
Leroy, of Paris, in the Empire of France.
I, HENRY EDWARD NEWTON, of the Office for Patents, 66, Chancery
Lane, in the County of Middlesex, Civil Engineer, do hereby declare the.
nature of the said Invention for "IMPROVED APPARATUS FOR ENLARGING AND
REDUCING BASSO-RELIEVOS, PLANS OR DRAWINGS, AND WRITINGS," to be as
follows:-
The object of this Invention is to construct an apparatus for
reproducing on a larger or smaller scale basso-relievos, drawings,
writings, or plans from any original relievo, drawing, or plan.
The apparatus consists of a suitable framework or table, and on the
top are grooves, which form guides for four sets of small wheels or
rollers destined to carry two horizontal rectangular platforms or drawing
boards, on which the drawing or basso-relievo to be enlarged or
diminished is placed. At one end of the machine, but in the centre of

page_text: its width, is mounted a vertical spindle, having its bearings in the cross
pieces of the framework. The lower part of this spindle is enlarged so
as to permit of a vertical slot being cut in it to receive one end of a short
connecting rod (the other end being pivotted to a motor wheel by a ball-
and-socket joint), which is held there by means of a pin or bolt. The
upper end of the spindle projects some distance above the level of the
two platforms, and carries an arm (a little longer than the total length
of the two platforms) consisting of two bars coupled together by bolts,
and pivotted to the head of the spindle by a pin, and carrying at its
further end an adjustable marker or pointer. Between these two bars,
and also pivotted to the spindle head, is another smaller and shorter arm,
also carrying an adjustable marker or pointer. This short arm has a
regulator fixed to it, whereby its position and mode of operating may he
adjusted according to whether it be desired to reduce or enlarge. The
motor wheel has fixed to it, besides the connecting rod, a pin or peg that
can be lengthened or shortened at pleasure, and which in following the
motion of the wheel describes vertically a circle. This pin or peg takes
into the spokes of a lantern or mangle wheel mounted on a vertical
shaft and turns it the required distance. On the shaft of this lantern or
mangle wheel is mounted a toothed wheel, but of smaller diameter,
which gears into a similar wheel mounted on a second vertical shaft.
Each of these shafts is respectively perpendicular to the centre of the
under surfaces of the platforms. On the top of these shafts are re-
spectively fixed horizontally two circular discs of different diameters,
and each is furnished with a pin that works in a transverse groove cut
in the under side of the platforms. The rotating peg or pin by acting
on the lantern or mangle wheel moves the toothed wheels, which in
their turn give motion to the circular discs, and thus, by means of the
pins in the transverse grooves of the platforms, move these latter forward
or backward, as desired, and one of the circular discs being double the
size of the other one platform will be moved double the distance of the
other.
Suppose it be desired to enlarge a bass-relief the model or original

page_text: operate upon the plastic material is terminated by a small spoon or scoop,
which will cut away the material as it is drawn over the surface.
Plans or drawings on plane surfaces may be enlarged or reduced by
means of the same apparatus, merely substituting suitable instruments
for the tools employed for operating upon plastic or soft materials. If
desired the lines to be produced for the copy may be produced by
electrical agency by placing the paper upon a non-conducting surface
and preparing the paper with suitable chemical agents, as is well
known,