Year: 1783

page_text: LONDON:
PRINTED BY GEORGE E. EYRE AND WILLIAM SPOTTISWOODE,
PRINTERS TO THE QUEEN'S MOST EXCELLENT MAJESTY :
PUBLISHED AT THE GREAT SEAL PATENT OFFICE,
25, SOUTHAMPTON BUILDINGS, HOLBORN.

page_text: WRIGHT'S SPECIFICATION.
TO ALL TO WHOM THESE PRESENTS SHALL COME, 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 First day of February, in the twenty-third year of
His reign, did give and grant unto me, THOMAS WRIGHT, of the Poultry,
London, Watchmaker, His especial licence, full power, sole privilege and
authority, that I, the said Thomas Wright, my exors, admors, and assigns,
and every of us, during the term of years therein expressed, should and
lawfully might use, exercise, and vend my "NEW-INVENTED WATCH OB
TIMEKEEPER," within that part of the Kingdom of Great Britain called
England, the Dominion of Wales, and Town of Berwick-upon-Tweed, in
such manner as to me, my exors, admors, and assigns, or any of us, should
in our discretion seem meet; in which said Letters Patent is contained a
proviso that if I, the said Thomas Wright, should not particularly describe
and ascertain the nature of my said Invention, and in what manner the same
is to be performed, by an instrument in writing under my hand and seal, 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, that then the same Letters Patent, and all liberties and
advantages whatsoever thereby granted, should utterly cease, determine, and
become void, as in and by the said Letters Patent, reference being there-
unto had, will more fully and at large appear.

page_text: NOW KNOW YE, that I, the said Thomas Wright, in pursuance of and
in compliance with the said proviso, and the purport and true intent and
meaning of the said Letters Patent, and of His Majesty's said most gracious
intention, do, by this present Instrument in writing under my hand and
seal, duly executed, declare that my said New-invented Watch or Time-
keeper is describ'd in the Plan or Drawing hereunto annext.
In witness I, the said Thomas Wright, have hereunto set my hand and
seal, this Twenty-ninth day of May, in the twenty-third 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 eighty-three.

page_text: the ends at C. C. and when Cool, the contrary, which will raise the Rods F.F. which are fastened to the ends of the cross bars C.C. and pass loose thro' the Ball and at the
tower end are fastened to the Cross Bow G.G. which is compounded like the upper only The upper side is the most expansive Metal and when it receives a greater
degree of heat becomes raised in the middle wherein is fixed a price of Steel or other Metal which passes up to the center of the Ball which rests on it so that as
the pendulum Rod expands or becomes longer the Ball of the pendulum is by means of the two cross Barss B.B and G. G. raised in the same proportion so that in all
degrees of heat and cold the pendulum remains the same length...
as
Nº2 represents a Cross Bar of Compound Metal
on a Frame at each end and the pendulium
•Pendulums by laying
: before described and may be applied to common
suspended in the middle over the notch in the back cock which when the upper side of the Bar which is made of more expensive metal than the lower side (the
two being united together, expands more than the lower it will raise or draw the pendulum Spring through the notch in the back back lock so us to keep the pendulum: alway
of the same length in every degree of heat and cold.
the Ball.
N: 3. represents two compieind bars with the pendulum suspended in the upper one and passes through the lower one the upperside of the rapper Bar and the lower side of the
under Bax being the most expansive Metals so that when both Bars become warmer they become at a greater distance consequently the upper bar draws the pendulum Spring sep
through the notch in the lower bar so as always to keep the pendulum the same length from the lower side of the notch to the centre of
Nº4. represents a compound bar fixed firm on the back plate at one end the upper side being the most expansive Metal as before described and the lower side being steel or
Tron with a notch' near the extreme end at I and the pendulum being suspended on a Cock fixed above the expansion Bar as the expansion Rar receives a greater degree of hear
it dip or depress the extrinity at I. in the same proportion as the pendulum underneath is expanded so as to preserve the pendulum in all degies of heat and cold the same tingth
N°5 represents a Ballance with four crisses or arms the inside of the rim of Steel and the outside of Copper Silver and Zink & the kims being suit through as at II II. and the Ballance being
heaviest in the hims near the notches as at L. I. will as the Ballance becomes warmer the most expansive Metal being on the outside coil or force the exnemity at I nearer the
Centre of the Ballance so as to counter act the natural expansion of the Bullance, the Ballance Spring consequently the Watch or Clock will keep the same time in heat and cold.
Nº6 represents another Ballance having three crosses or Arms with a Ball near the extremity of each part of the Rim and the most expensive Metal solder d on the outside of the rim
' as in N.5 in order when it receives a greater degree of heat that the Balls at the extremities may be brought near the centre so as to counteract the expansion and contaction
that the time price may keep the same time in different digrees of heat and cold...
N. I. represents the pendulum Scrapement M the Gown or Ballance Wheel with pins on the side to act as teeth N. a detent with a price fixed on it at one end of which is a
Hook which receives the Tooth the other end has a Weight or Ball on it so as to make that end of the Lever rather heavier than the other 0 represents that part which
is fastened to the Verge Staff and an Arm to P. where Q the palate is fixt on twe small pivots at P. and as the pendulum vibrates does by means of a Ball or Weight
at R near the end of the Liver & drop into the Tooth and disengage the hook at the end of the Lever N and recives the Tooth on Q when the Tooth gives the
impulse to the pendulum and as it returns the Lever ? is raised over the tooth by a pin fixed in it which makes it to slide over it.
("
N.º 8 represents the Balance Wheel for the Ballance Scapement with pallate and Spring for locking and unlocking the Wheel near the end of the Stud S. the Spring
is fund mi and the during is fund in oprire as at To act the other end of which prices is as Nin or hook which locks the while at T which is unlocked by a pun
•Stronger piece a part of the piece T. lifts the flin or carin
C.D. fixed on the verge with a sharp edge outwards that bears against the Spring and the Spring bearing on a
in T'out of the Wheel and the Tooth bears on the pallate 4.B. and gives impulse to the Ballance and the Spring then bends at U and when the Bullence returns the
pin 1. D. bearing on the contrary side of the Spring the Spring bends at W. and the piece T. which locks the Wheel remains in the Tooth & the Wheel continues locked while the
lighter on the Wheel V a Stud and a
discharging Pm C. D. passes by it X. is a Stud and Screw the point of which bears on the Spring to make it bear stronger or
Screw the point of which bears on the Stud I to set the locking and unlocking Spring deeper or shallower on the verge as occasion may require. __