AN IMPROVED INSTRUMENT FOR MARKING OR CUTTING SCROLLS AND OTHER CURVED FIGURES
Year: 1874

page_text: LETTERS PATENT to William Robert Lake, of the Firm of Haseltine,
Lake, & Co., Patent Agents, Southampton Buildings, London,
for the Invention of "AN IMPROVED INSTRUMENT FOR MARKING OR
CUTTING SCROLLS AND OTHER CURVED FIGURES."-A communication from
abroad by Israel Kinney and Thomas White Smart, both of
London, in the Province of Ontario, Canada.
PROVISIONAL SPECIFICATION left by the said William Robert Lake
at the Office of the Commissioners of Patents, with his Petition,
on the 22nd April 1874.
I, WILLIAM ROBERT LAKE, of the Firm of Haseltine, Lake, & Co.,
Patent Agents, Southampton Buildings, London, do hereby declare the
nature of the said Invention for "AN IMPROVED INSTRUMENT FOR MARKING
OR CUTTING SCROLLS AND OTHER CURVED FIGURES," a communication, to be as
follows:-
This Invention relates to a new and useful instrument for making or

page_text: cutting scrolls and all geometrical and irregular curved lines more
accurately, more easily, and more expeditiously than has heretofore been
practicable by the use of compasses or other instruments, and without
mathematical calculations.
The said Invention consists in causing a point while revolving around
a centre to gradually recede from or approach the said centre by means
of a disc or roller attached thereto, and having the axis thereof at an
angle more or less acute to the said centre around which it is intended to
make the scroll or curved line.
I use a disc or roller of metal or other suitable material which is
attached to a stay by an axle. This stay is fixed to one of the logs of a
pair of compasses, and adjusted so that the axis of the said disc is
presented at an angle more or less acute to the point of the other leg or
centre around which the scroll or curved line is desired to be made. The
leg is allowed to work freely, and on turning the compasses round while a
slight pressure is used, the periphery of the disc or roller will follow the
direction of the axis, and if stationary will follow the direction of its
edge and cause the leg to expand or contract, and the degree of this
cxpansion or contraction will depend upon the angle at which the
periphery of the disc is set to the centre around which it moves. The
sharp edge of this disc will in general be found to leave a sufficient mark
on the surface of wood, metal, leather, or paper on which it is used; or
on sufficient pressure being applied it can be made to cut quite through
thin substances, for the purpose of making patterns and the like. A
pen or pencil point attached to the same limb of the compasses will
accurately follow the disc and mark the scroll or geometrical figures it
describes.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said William Robert Lake in the Great Seal Patent
Office on the 21st October 1874.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, WILLIAM
ROBERT LAKE, of the Firm of Haseltine, Lake, & Co., Patent Agents,
Southampton Buildings, London, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Twenty-second day of April, in the year
of our Lord One thousand eight hundred and seventy-four, in the thirty-
seventh year of Her reign, did, for Herself, Her heirs and successors,
give and grant unto me, the said William Robert Lake, Her special
licence that I, the said William Robert Lake, my executors, adminis-
trators, and assigns, or such others as I, the said William Robert Lake,
time agree
with
my executors, administrators, and assigns, should at any
and no others, from time to time and at all times thereafter during
the term therein expressed, should and lawfully might make, use,
exercise, and vend, within the United Kingdom of Great Britain and
Ireland, the Channel Islands, and Isle of Man, an Invention for "AN
IMPROVED INSTRUMENT FOR MARKING OR CUTTING SCROLLS AND OTHER CURVED
FIGURES," a communication to me from abroad by Israel Kinney and
Thomas White Smart, both of London, in the Province of Ontario,
Canada, upon the condition (amongst others) that I, the said William
Robert Lake, my executors or administrators, by an instrument in
writing under my, or their, or one of their hands and scals, should
particularly describe and ascertain the nature of the said Invention,
and in what manner the same was to be performed, and cause the
same to be filed in the Great Seal Patent Office within six calendar
months next and immediately after the date of the said Letters Patent.
NOW KNOW YE, that I, the said William Robert Lake, do hereby
declare the nature of the said Invention, and in what manner the same
is to be performed, to be particularly described and ascertained in and
by the following statement, reference being had to the accompanying
Drawing forming a part of this Specification:-
This Invention relates to a new and useful instrument for marking or
5 cutting scrolls and all geometrical and irregular curved lines more
accurately, more easily, and more expeditiously than has heretofore been

page_text: Figure 1 is a side clevation in perspective of a pair of dividers or
compasses with my Invention applied to them; Figure 2 shows a portion
of the same detached and drawn to an enlarged scale.
A disc or roller A of metal or other suitable material is attached to a
stay B by an axlo C. This stay is fixed to one of the legs D of a pair of
compasses, and so adjusted that the axis of the said disc is presented at
an angle more or less acute to the point of the other leg E or centre
around which the scroll or curved line is desired to be made. The leg D
is allowed to work freely, and on turning the compasses round while a
slight pressure is used, the periphery of the disc or rolier A will follow
the direction of the axis, and if stationary will follow the direction of its
edge and cause the leg to expand or contract, and the degree of this
expansion and contraction will depend upon the angle at which the
periphery of the disc is set to the centre around which it moves. The
sharp edge of this disc will in general be found to leave a sufficient mark
on the surface of wood, metal, leather, or paper on which it is used; or
on sufficient pressure being applied it can be made to cut quite through
thin substances, for the purpose of making patterns and the like. A
pen or pencil point attached to the same limb of the compasses will
accurately follow the disc and mark the scroll or geometrical figures it
logomihoo

page_text: First. A pointed instrument or disc so arranged with relation to the
leg of a divider or a sliding bar or trammel that true or irregular curves
or other geometrical figures may be delineated and accurately described
without mathematical calculations, as herein set forth.
Second. The disc or wheel A supported in the adjustable holder B, in
combination with the leg D of a pair of compasses or their equivalent,
constructed and arranged to operate as herein described.
In witness whereof, I, the said William Robert Lake, have hereunto
set my hand and seal, this Twenty-first day of October, in the
year of our Lord One thousand eight hundred and seventy-four.
Witness,
JAMES EDWARDS,
8, Southampton Buildings,
London.
W. ROB. LAKE. (L.S.)