CERTAIN IMPROVEMENTS IN CHRONO- METERS AND OTHER TIMEKEEEPERS
Year: 1838

page_text: TO ALL TO WHOM THESE PRESENTS SHALL COME, I, EDWARD
JOHN MASSEY, of Liverpool, in the County of Lancaster, Watch Maker, send
greeting.
WHEREAS Her present most Excellent Majesty Queen Victoria, by Her
Letters Patent under the Great Seal of Great Britain, bearing date at West-
minster, the Ninth day of June, in the first year of Her reign, did, for Her-
self, Her heirs and successors, give and grant unto me, the said Edward
John Massey, Her especial license, full power, sole privilege and authority..
that I, the said Edward John Massey, my exors, admors, and assigns, or
such others as I, the said Edward John Massey, my exors, admors, or
assigns, should at any time agree with, and no others, from time to time and
at all times during the term of years therein expressed, should and lawfully
might make, use, exercise, and vend, within England, Wales, and the Town
of Berwick-upon-Tweed, my Invention of "CERTAIN IMPROVEMENTS IN CHRONO-
METERS AND OTHER TIMEKEEEPERS;" in which said Letters Patent is contained
a proviso, that I, the said Edward John Massey, shall cause a particular
description of the nature of my said Invention, and in what manner the same
is to be performed, to be inrolled in Her said Majesty's High Court of
Chancery within six calendar months next and immediately after the date of
the said in part recited Letters Patent, as in and by the same, reference being
thereunto had, will more fully and at large appear.

page_text: NOW KNOW YE, that in compliance with the said proviso, I, the said
Edward John Massey, do hereby declare the nature of my Invention, and the
manner in which the same is to be performed, are fully described and ascer-
tained by the following statement thereof, reference being had to the Drawing
hereunto annexed, and to the figures and letters marked thereon, that is
to say :-
DESCRIPTION OF THE DRAWING.
A, the pallet wheel; B, the pallet; C, the small unlocking pallet. These
are placed on the arbour of the verge in the ordinary way of making the
detached chronometer escapement. D is the point of the unlocking detent;
E is the spring acting upon a pin at F, which projects from the arbour of the
unlocking detent when the balance is moved to the right; the unlocking
pallet C moves back the unlocking detent, which is returned to its former
situation by the spring E. H is the locking detent, the point of which locks
the wheel at I when the balance is moved to the left, the small pallet
coming in contact with the point of the unlocking detent, which rests
against a pin projecting from the top of the locking detent at J, lifts it
(the locking detent) out of the wheel, and the impulse is communicated to
the verge in the usual way, when both detents are returned to their former
situation by the spring G, which acts upon a pin projecting from the
arbour of the locking detent, which spring G, being twice the strength of the
spring E, presses both it (the locking detent) and the unlocking detent (which
is the weaker spring) is always pressing against the locking detent, except
when the verge lifts it in passing the right-hand way to their proper situation,
and the tail end of the locking detent falls against the stop at K. The springs
E and G are fastened in the studs L, and can have more or less tension given
to them by turning them right or left. This view of the escapement is from
the inside of the potter's plate.
What I claim as new is the two detents upon separate axles, which give me
the advantage of using very delicate springs, and of locking the pallet wheel
very near to the centre of a circular detent, and of unlocking it without passing
the verge farther than is requisite in other chronometer escapements, so that
the balance is less opposed in raising the locking, and in its return after
receiving the impulse, by which means the same mean power is enabled to
carry a much heavier balance.
In witness whereof, I, the said Edward John Massey, have hereunto set
my hand and seal, this Fourth day of December, One thousand eight
hundred and thirty-eight.
.
EDWARD JOHN (L.S.) MASSEY.

page_text: AND BE IT REMEMBERED, that on the Fourth day of December, in the
year of our Lord 1838, the aforesaid Edward John Massey came before our
said Lady the Queen in Her 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 stamped according
to the tenor of the Statute made for that purpose.
Inrolled the Eighth day of December, in the year of our Lord One
thousand eight hundred and thirty-eight.