A NEW METHOD OF CONSTRUCTING AND MAKING REFRACTING TELESCOPES WITH OBJECT GLASSES THEREIN, COMPOSED OF TWO OR MORE DIFFERENT GLASSES OR MEDIUMS SEPARATE AND DISTINCT FROM EACH OTHER, AND SO PLACED IN THE TUBE AS THAT, BY ALTERING THE OF THE F , (FOR WHICH PURPOSE ONE OR MORE OF THEM IS OR ARE CONTRIVED TO BE INSTANTLY MOVEABLE TO THE PROPER DANCE), THE GLASSES WILL HAVE GREATER OR LESSER MAGNIFYING POWERS WITHOUT DESTROYING THE EFFECT ARISING FROM THE DIFFERENT REFRACTIVE QUALI- TIES OF THE SEVERAL MEDIUMS, BY WHICH MEANS A REFRACTING TELESCOPE OF ANY LENGTH MAY BE MADE TO SUIT ANY EYE AND ANY SORT OF WEATHER, AND ANSWER THE PURPOSE OF TELESCOPES OF SUPERIOR OR INFERIOR LENGTHS
Year: 1770

page_text: TO ALL TO WHOM THESE PRESENTS SHALL COME, I, HENRY
PYEFINCH, of Cornhill, London, Optician, send greeting.
WHEREAS His present most Excellent Majesty King George the Third,
by His Letters Patent under the Great Seal of Great Britain, bearing date at
Westminster, the Twenty-eighth day of December, in the cleventh year of His
reign, did give and grant unto me, the said Henry Pyefinch, my executors,
adiors, and assigns, His especial licence to use, exercise, and vend, during the
term of fourteen years therein mentioned, within that part of Great Britain called
England, His said Majesty's Dominion of Wales, and Town of Berwick-upon-
Tweed, and also within His said Majesty's Plantations and Colonies abroad, my
Invention of "A NEW METHOD OF CONSTRUCTING AND MAKING REFRACTING TELESCOPES
WITH OBJECT GLASSES THEREIN, COMPOSED OF TWO OR MORE DIFFERENT GLASSES OR
MEDIUMS SEPARATE AND DISTINCT FROM EACH OTHER, AND SO PLACED IN THE TUBE AS
THAT, BY ALTERING THE DISTANCE OF THE ONE FROM THE OTHER, (FOR WHICH PURPOSE
ONE OR MORE OF THEM IS OR ARE CONTRIVED TO BE INSTANTLY MOVEABLE TO THE
PROPER DISTANCE), THE GLASSES WILL HAVE GREATER OR LESSER MAGNIFYING POWERS
WITHOUT DESTROYING THE EFFECT ARISING FROM THE DIFFERENT REFRACTIVE QUALI-
TIES OF THE SEVERAL MEDIUMS, BY WHICH MEANS A REFRACTING TELESCOPE OF ANY
LENGTH MAY BE MADE TO SUIT ANY EYE AND ANY SORT OF WEATHER, AND ANSWER
THE PURPOSE OF TELESCOPES OF SUPERIOR OR INFERIOR LENGTHS;" in which said
Letters Patent is contained a provisoe or condition requiring and obliging
me, the said Henry Pyefinch, to cause a particular description, under my hand

page_text: and seal, of the nature of the said Invention, and how the same is to be per-
termed, to be inrolled in His Majesty's High Court of Chancery within four
calendar months next after the date of the said Letters Patent, as in and by
the said recited Letters Patent, relation being thereunto had, will more fully
and at large appear.
NOW KNOW YE, that I, the said Henry Pyefinch, in compliance with
and performance of the aforesaid provisoe or condition, do hereby describe and
specify the nature of the said Invention, and how the same is to be performed,
in manner following (that is to say) :-
The two or more mediums or glasses which compose the object glass are
separate and distinct from each other, and one or more of those glasses is or
are fixed in a brass cell sliding within a small tube, with marks or figures
thereon to ascertain the several focal distances corresponding with the like
marks or figures on the tube wherein the eye-glasses are contained, and such
brass cell is contrived so as to be easily moved with the finger and thumb
backwards and forwards by means of two small brass buttons nearer to or
further from the other medium or mediums that compose the object glass, by
which the focal length or magnifying power of the object glass may be so
varied as in one and the same telescope, without making any change of the
eye-glasses, to give the requisites and perfections of two or more telescopes of
different lengths, as, by moving one or more of the mediums nearer to the other
or others, the focus of the object glass is thereby lengthened, and vice versa,
and the glasses are put in different and soparate cells, so that they may be
easily taken out in order to clean their inward surfaces.
And I, the said Henry Pyefinch, do hereby averr and declare that the above
is a true, full, and perfect description of the nature and practice of my said
Invention.
In witness whereof, I, the said Henry Pyefinch, have hereunto set my
hand and seal, the Twelfth day of April, in the eleventh year of the
reign of our Sovereign Lord George the Third, by the grace of God
of Great Britain, France, and Ireland King, Defender of the Faith,
and so forth, and in the year of our Lord One thousand seven
hundred and seventy-one.
Sealed and delivered (being first duly
stamped) in the presence of
LUKE CURRIE,
NATH NICHOLLS.
H' PYEFINCH. (L.S.)

page_text: AND BE IT REMEMBRED, that on the same Twelfth day of April, in
the
year last above mentioned, the aforesaid Henry Pyefinch came before our
said Lord the King in His Chancery, and acknowledged the Specification
aforesaid, and all and every thing therein contained, 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, & so forth.
Tolled the Thirteenth day of April in the year aforesaid.