NEW-INVENTED LIGHT PORTABLE SPRING JACK, WHCH GOES ONE HOUR AND THREE QUARTERS, HAVING A REFLECTOR TO INCREASE THE HEAT, SO AS TO SAVE TWO THIRDS OF THE USUAL FIREING
Year: 1773

page_text: TO ALL TO WHOM THESE PRESENTS SHALL COME, JOSEPH
MERLIN, of Little Queen Anne Street, in the Parish of Saint Maryle-
bone, in the County of Middlesex, Mathematical Instrument Maker, sends
greeting.
WHEREAS the King's most Excellent Majesty, by Letters Patent under
the Great Seal of Great Britain, bearing date the Twenty-ninth day of January
last, gave and granted unto the said Joseph Merlin, his executors, adminis-
trators, and assigns, His Majesty's special licence, full power, sole privilege
and authority, for the said Joseph Merlin, his executors, adiñors, or assigns,
and every of them, by himself or themselves, or by his or their deputy or
deputies, servants or agents, or such others as he, the said Joseph Merlin,
his executors; adññors; or assigns, should at any time agree with, and no other,
from time to time and at all times thereafter, to make, use, exercise, and vend
his "NEW-INVENTED LIGHT PORTABLE SPRING JACK, WHCH GOES ONE HOUR AND THREE
QUARTERS, HAVING A REFLECTOR TO INCREASE THE HEAT, SO AS TO SAVE TWO THIRDS
OF THE USUAL FIREING;" to have, hold, exercise and enjoy the said licence,
power, privilege, and advantage to the said Joseph Merlin, his executors,
adiñors, and assigns, for the term of fourteen years from the date of the said
Letters Patent next and immediately ensuing, and fully to be compleat and
ended, according to the Statute in that case made and provided; in which
said Letters Patent is contained a provisoe that if I, the said Joseph Merlin,
should not particularly describe and ascertain the nature of the said Invention,
and in what manner the same is to be performed, by an instrument in writing

page_text: under my hand and seal, and cause the same to be inrolled in the High Court
of Chancery within four kalender months next immediately after the date
of the said Letters Patent, that then the said Letters Patent, and all liberties
and advantages whatsoever thereby granted, should utterly cease and become
void.
NOW KNOW YE, that I, the said Joseph Merlin, in pursuance of the
said proviso in the said Letters Patent contained, do hereby declare that the
nature of the said Invention, and the manner in which the same is to be
performed, appears and is described in the Schedule or Drawings hereunto
annext.
In witness whereof, I, the said Joseph Merlin, have hereunto set my hand
and seal, the Tenth day of April, in the thirteenth year of the reign
of our Sovereign Lord George the Third, King of Great Britain, &c.,
and in the year of our Lord One thousand seven hundred and seventy-

page_text: 10
contains a spring
o go with or without Fuzee having four brass wheels a pinion and fly and will go either with a Chain or Catgut.
Fig 2. Is a Plan Dissection or profile of the said movement as follows vizt (a) is the Fly and worm (b) is the box which contains
the Spring (c) is the cinke wheel for the communication to the spitt (d) is that which puts the said Centre wheel in motion (e)
is the Fuzu wheel (f) is the worm wheel or fly wheel.
Fig. 3. Is.
a
Reflector made of tin or
any
other polished metal which contains the said movement at letter (c) also the spit meat
and dripping pan and is made hollow or concave in order to reflect the heat on the meat to quicken the roasting thereof and
consists of the parts following (a) is the winch (b) is the handle (c.c) is the body of the Reflector (d.d.d) are the legs made of
iron and screwed on to the bottom of the Reflector and roasts perpendicularly.
4. Is the same Reflector or Machine with the Fuck fixed at bottom as at letter (a
ig : 5 Is the same Reflector or Machine having the spit horizontal with the movement as at letter (a/
gr 6 Is the same Reflector the spit in which is set in motion in any direction whatsoever by
a Ventilator.
9 ½ 7. Is the spitt and an horizontal wheel made of Tin or any other metal and is fixt on the perpendicular Spit as at Fig 3 being
full of small hooks for the convenience of Roasting a number of small birds ct at one and the same time (a.a. a.) is the split (b) is
the wheel (c) are the hooks to hang the birds on e.e. two large hooks to confine the meat on the spit.
78. Is a plan or Dissection of the Ventilator fat Fig 6/described as follows. (a) is the Ventilator made of Tin or any other metal-
(b) is a worm (c) is a worm wheel (c.c) is the Arbour made of any metal (d) is a pinion which drives the wheel following in motion
(dd) is the spit wheel with a spiral spring to slide over the spit (e) is the handle to the spit (f) is the spiral spring (9.9.) is the spit-_