AN OPTICAL INSTRUMENT, CALLED AN ACCURATE DELINEATOR, WHICH, AMONGST ITS MANY PERFECTIONS, INTIRELY OBVIATES THE DEFECTS OF THE CAMERA OBSCURA, AS IT MAY NOT ONLY BE USED WITHOUT THE ASSISTANCE OF THE SUN IN THE DAY TIME, BUT ALSO EQUALLY OF USE BY CANDLE LIGHT, FOR DRAWING THE HUMAN FACE, INSIDE OF ROOMS, BUILDINGS, PERSPECTIVES, LANDSCAPES, FOILAGE AND FIBRES OF TREES AND FLOWERS, IT EXACTLY REPRESENTING THE SAME, LARGE OR SMALL, WITH THE TRUE OUTLINES,LIGHTS, SHADES, AND COLOURS
Year: 1778

page_text: TO ALL TO WHOM THESE PRESENTS SHALL COME, I, WILLIAM
STORER, of Lisle Street, Leicester Fields, in the County of Middlesex,
Gentleman, send greeting.
WHEREAS I, the said William Storer, did, by my Petition, humbly repre-
sent unto His present most Excellent Majesty King George the Third that
I had, with much labour and expence, by a new art or science, invented "AN
OPTICAL INSTRUMENT, CALLED AN ACCURATE DELINEATOR, WHICH, AMONGST ITS
MANY PERFECTIONS, INTIRELY OBVIATES THE DEFECTS OF THE CAMERA OBSCURA,
AS IT MAY NOT ONLY BE USED WITHOUT THE ASSISTANCE OF THE SUN IN THE
DAY TIME, BUT ALSO EQUALLY OF USE BY CANDLE LIGHT, FOR DRAWING THE
HUMAN FACE, INSIDE OF ROOMS, BUILDINGS, PERSPECTIVES, LANDSCAPES, FOILAGE
AND FIBRES OF TREES AND FLOWERS, IT EXACTLY REPRESENTING THE SAME,
LARGE OR SMALL, WITH THE TRUE OUTLINES, LIGHTS, SHADES, AND COLOURS," all
which effects were new and discovered by me, and which I apprehend would
be of great publick utility, and in regard I was the first and true inventor,
and the same had not been practised or used by any other person or persons
to my knowledge and belief, I therefore most humbly prayed His said
Majesty to grant unto me, my executors, administrators, and assigns, His
Letters Patent for the term of fourteen years, for the sole benefit and advan-
tage of the said Invention; His said Majesty, being therefore willing to give
encouragement to all arts and inventions that may be for the publick good,
did, by His Letters Patent under the Great Seal of Great Britain, bearing
date at Westminster, the Fourth day of March, in the eighteenth year of
His reign, give and grant unto me, the said William Storer, my executors,

page_text: administrators, and assigns, His special licence, full power and authority, that
I, the said William Storer, my executors, admors, and assigns, should and
might lawfully make, use, exercise, and vend my said Invention within that
part of Great Britain called England, the Dominion of Wales, and Town of
Berwick-upon-Tweed, in such manner as to me, my executors, adññors, and
assigns, should seem meet, for and during and unto the full end and term of
fourteen years from the date of the said recited Letters Patent; in which
said Letters Patent is contained a provisoe obliging me, the said William
Storer, by an instrument in writing under my hand and seal, to cause a parti-
cular description of the nature of my said Invention, and in what manner the
same is to be performed, to be inrolled in His Majesty's High Court of
Chancery within four calendar months next and immediately after the date of
the said recited Letters Patent, otherwise the said Letters Patent, and all
powers and priviledges thereby granted, should cease, determine, and become
void, as in and by the said Letters Patent (reference being thereunto had)
may more fully and at large appear.
NOW KNOW YE, that I, the said William Storer, in pursuance of the
said provisoe, do hereby describe my said Invention in manner following (that
is to say):
The accurate delineator may be made of various forms, and the effects above
mentioned arise from a new-invented application of lenses, mirrors, speculums,
prisms, or mediums of lenses of glass, or any composition containing reflecting
or refracting powers. The rays from the object are at first received on or
conveyed to a mirror or speculum placed at a proper angle in the inside of a
tube or box by one or more convex lens or medium of lenses before the mirror
or speculum. In cases where the object is conveyed thro' a lens or medium
of lenses on the mirror or speculum, one or more convex lenses or medium of
lenses must be applied to correct and illuminate the rays, and to receive from
the mirror or speculum the rays from the objects conveyed thereon through
the first-mentioned lens or medium of lenses; but in cases where the rays from
the objects are received in the first place on the mirror or speculum, a convex
lens or medium of lenses must be placed fixed or moveable next after the
mirror or speculum, to collect the rays from the mirror or speculum; and at a
proper distance from the first lens or medium of lenses must be applied one
or more convex lens or medium of lenses to correct and illuminate the rays
from the first lens or medium of lenses, by which means all rays that are
spherically refracted through the first medium will be made parallel, and
consequently all objects are accurately represented and all parts thereof equally
illuminated on the lens or medium lenses so receiving and correcting the rays

page_text: of the objects received from the mirror or speculum, or first lens or medium of
lenses, and gives the most lively and exact representation of the objects, either
by the light of the sun, moon, or any other light. In all cases the size of the
aperture or medium through which the rays first pass must govern the size
and powers of the correcting lens or medium, both contrary to the principals of
the camera obscura. A prism, mirror, or speculum placed at a proper angle
to reflect the image on the first lens or medium of lenses, mirror, or speculum,
the objects will be represented in their true shape, figure, and form; and a
collecting or correcting lens or lenses, or medium of lenses, to collect or correct
the rays from the images presented by a reflecting microscope, magick
lanthorn, camera obscura, or other instrument of the like nature, instantly
forms the accurate delineator, the principals of the accurate delineator being
not so much in the form or figure of the instrument, as to collect and correct
and illuminate the faint and imperfect rays from the objects received thro'
these instruments.
In witness whereof, I, the said William Storer, have hereunto set my
hand and seal, the Twenty-ninth day of June, in the eighteenth year
of the reign of His said Majesty King George the Third, and in the
year of our Lord One thousand seven hundred and seventy-eight.
AND BE IT REMEMBRED, that on the same Twenty-ninth day of
June, in the year above mentioned, the aforesaid William Storer came before
our said Lord the King in His Chancery, and acknowledged the Specification
aforesaid, and all and every thing therein contained and specified, in form
above written. And also the Specification aforesaid was stampt according to
the tenor of the Statute made in the sixth year of the reign of the late
King and Queen William and Mary of England, and so forth.