ing "A NEW MACHINE FOR TURNINGSPITS FOR ROASTING OF MEAT INSTEAD OF A JACK WHICH WILL GO SIX HOURS, AND UPWARDS IF NECESSARY, WITHOUT WINDING UP OR ANY OTHER TROUBLE; AND THE SAME MACHINE UPON AN ENLARGED PLAN WILL DRAW AND RAISE WATER OUT OF MINES, WHEREBY THE GREAT EXPENCE OF FIRE AND OTHER ENGINES MAY BE SAVED TO THE OWNERS OF SUCH MINES
Year: 1767

page_text: TO ALL TO WHOM THESE PRESENTS SHALL COME, JOHN DUNCOMBE,
of Ludlow, in the County of Salop, Mathematician, sendeth greeting.
WHEREAS His present Majesty, by His Royal Letters Patent, bearing
date on or about the Eighteenth day of May last, in the seventh year of His
reign, was graciously pleased to grant to me, the said John Duncombe, and
Joseph Polile, of Ludlow aforesaid, Engraver, our executors, adiñors, and
assigns, the sole making and vending "A NEW MACHINE FOR TURNINGSPITS FOR
ROASTING OF MEAT INSTEAD OF A JACK WHICH WILL GO SIX HOURS, AND UPWARDS
IF NECESSARY, WITHOUT WINDING UP OR ANY OTHER TROUBLE; AND THE SAME MACHINE
UPON AN ENLARGED PLAN WILL DRAW AND RAISE WATER OUT OF MINES, WHEREBY
THE GREAT EXPENCE OF FIRE AND OTHER ENGINES MAY BE SAVED TO THE OWNERS
OF SUCH MINES," within that part of His Majesty's Kingdom of Great Britain
called England, Dominion of Wales, and Town of Berwick-upon-Tweed, for
the term of fourteen years; in which said Letters Patent is contained a proviso,
for me, the said John Duncombe, and the said Joseph Polile, to describe and
ascertain the nature of the said Invention, and how the same is to be per-
formed, by an instrument in writing.under our hands and seals, or under the
hand and seal of one of us, and cause the same to be inrolled in His Majesty's
High Court of Chancery within four calendar months next and immediately
after the date of the said Letters Patent, as in and by the same, relation
being thereunto had, may more fully and at large appear

page_text: NOW KNOW YE, that, in compliance with and performance of the said
proviso, I, the said John Duncombe, do hereby describe and ascertain the
nature of the said Invention, in manner following (that is to say)
The machine consists of several wheels and pinions, whose numbers may
be varied at pleasure, and are regulated by a vertical fly, made with vanes,
to loose or gather air as required. The spring acts upon a pinion instead
of a fusee, to prevent its being out of order, and is regulated by a weight
acting upon a fusee that is confined to the spring box, in such manner that
as the tension of the spring diminishes, the power of the weight increases in
the selfsame ratio; the power of the weight acting on the fusee must be
equal to the difference of the spring's tension. To the above is added a
time-piece which acts between the front of the jack and dial plate, that
consists only of a two-threaded worm confined to the arbor of the fusee,
which drives another single-threaded worm by a pinion, whose number may be
varied according to the turns the fusee is to make in any proposed time.
This single-threaded worm turns the hand by a pinion, whose number is equal
to the complement of the other worms and pinions, so that the hand may go
round once in twelve hours. The jack is wound up through the dial plate by a
pinion and rochet, confined to the arbor of the spit wheel, whereby a great
purchase is obtained. Upon an enlarged plan an engine is formed to draw
water out of mines, &c., in which no spring is required, but a crank to be
annexed to the arbor of the spit wheel, in order to work the pistons; and
the said John Duncombe doth hereby declare and affirm that the particulars
above set forth do contain a full, true, and perfect description of the nature of
the said Invention.
In witness whereof, I, the said John Duncombe, have hereunto set my
hand and seal this Fifteenth day of September, in the seventh 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, &c., and in the year of our Lord One thousand seven hundred
and sixty-seven.

page_text: AND BE IT REMEMBRED that on the aforesaid Fifteenth day of
September, in the year above mentioned, the afores John Duncombe 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.
Inrolled the same Fifteenth day of September, in the year above written.