A NEW MACHINE OR REGULATOR BY ME INVENTED AND BROUGHT TO PERFECTION, INTENDED FOR THE BETTER DISCOVERY OF THE LONGITUDE AT SEA, TO GO BY A PENDULUM OF ANY LENGTH, FROM THIRTY-NINE INCHES TO FOUR INCHES, OR SHORTER, WHICH, BY A PECULIAR CONSTRUCTION, WILL VIBRATE SECONDS IN A TRUE AND REGULAR MANNER WHEN ON BOARD A SHIP AT SEA, AND ALTHOUGH PARTAKING OF ALL THE MOTIONS AND PARTICULAR DIRECTIONS OF SUCH SHIP YET WILL NOT IN THE LEAST BE THEREBY OBSTRUCTED OR DISORDERED, WHETHER THE SAME MACHINE OR CLOCK GOES BY WEIGHTS OR SPRINGS
Year: 1760

page_text: JENKINS, send greeting.
WHEREAS His present most Excellent Majesty King George the Second,
by His Letters Patent, bearing date at Westminster, the Thirty-first day of
January, in the thirty-third year of His reign, did give and grant unto me,
the said Henry Jenkins, my executors, administrators, and assigns, His
especial licence, full power, sole priviledge and authority, to use, exercise, and
vend "A NEW MACHINE OR REGULATOR BY ME INVENTED AND BROUGHT TO
PERFECTION, INTENDED FOR THE BETTER DISCOVERY OF THE LONGITUDE AT SEA,
TO GO BY A PENDULUM OF ANY LENGTH, FROM THIRTY-NINE INCHES TO FOUR
INCHES, OR SHORTER, WHICH, BY A PECULIAR CONSTRUCTION, WILL VIBRATE SECONDS
IN A TRUE AND REGULAR MANNER WHEN ON BOARD A SHIP AT SEA, AND ALTHOUGH
PARTAKING OF ALL THE MOTIONS AND PARTICULAR DIRECTIONS OF SUCH SHIP
YET WILL NOT IN THE LEAST BE THEREBY OBSTRUCTED OR DISORDERED, WHETHER
THE SAME MACHINE OR CLOCK GOES BY WEIGHTS OR SPRINGS," to hold, exercise,
and enjoy the benefit thereof for the term of fourteen years; in which said
Letters Patent there is contained a provisoe obliging me, the said Henry
Jenkins, particularly to describe and ascertain the nature of my said Inven-
tion, and in what manner the same is to be performed, by a writing under
my hand and seal, and cause the same to be enrolled in the High Court

page_text: of Chancery within four calendar months from the date of the said Letters
Patent, as in and by the same more fully and at large appears.
NOW KNOW YE, that I, the said Henry Jenkins, in compliance with
the said proviso, do hereby declare, describe, and ascertain the nature of my
said Invention, and the manner in which the same is to be performed as
follows (that is to say):-
A PARTICULAR DESCRIPTION OF A MARINE REGULATOR INTENDED FOR THE BETTER
DISCOVERY OF THE LONGITUDE AT SEA, INVENTED AND MADE BY HENRY
JENKINS, LONDON.
and
That this machine may go in any direction which a ship is liable to,
on the back frame plate is hung a small frame containing the verge; it is
hung on and has for its center the swing wheel. The bottom of this frame
must be weightier than the top, and turn freely on the part it is hung to.
The pallets work under the wheel, and by the weight of the bottom of the
frame the verge and swing wheel will keep always perpendicular one to
another. Instead of the bit of brass usual at the top of the pendulum spring
here is a pipe which goes on a stud in the back cock, and as this turns freely
it will so far agree with the crutch as to answer any sideway direction, and
when once properly scaped put in beat cannot go off of it again, except
some damage be done to it. Under the pipe is a joint which admits of any
motion forwards or backwards; thus will the machine go in any direction with
a pendulum. But as one of the common length would require much room to
swing in, and would otherwise be subject to great inconveniences on account
of its length on board a ship, and a short one, according to the common and
onely method (but this of mine), cannot keep so regular time as a long one,
owing to the quickness of its vibrations and the lightness of the bob'; there-
fore, to remedy all these I have added an upper part to the pendulum, which
reaches above where it is hung on to a little above a third of its whole length,
and on which is likewise a bob; by this means the length may be reduced
from thirty-nine inches to four inches, or shorter; but one from six to eight
inches may weigh about five pounds, and by properly adjusting the weight at
top to that at bottom it will vibrate seconds in a true and regular manner, it
being weighty, as slow in its motion, and therefore as much to be depended
upon for its regularity, as the best long one. On the dial plate is a hemisphere
which makes a revolution in the same time the earth turns once on its axis,
and goes the same way about, i. e. from west to east, and as here is a sun fixed
under the noon meridian so as all parts of the hemisphere comes against the
sun, it shews it is then noon to such part, pointing to the sun; over this is an

page_text: elipsis which crosses the pole to each side the polar circle. This divides the
day from night to all parts of the earth, shewing justly all their different
lengths of days and nights at all seasons of the year, as likewise the sun's
declination and present time of the day, &c. universally to all parts alike.
In witness whereof, I, the said Henry Jenkins, have hereunto set my
hand and seal, the Twenty-fourth day of May, in the year of our Lord
One thousand seven hundred and sixty.
AND BE IT REMEMBRED, that on the said Twenty-fourth day of
May, in the thirty-third year of the reign of His Majesty King George the
Second, the said Henry Jenkins came before our said Lord the King in His
Chancery, and acknowledged the Writing aforesaid, and every matter and
thing therein contained, in form above said. And the said Writing was
stamped according to the Statute made in the sixth year of the reign of the
late King William and Queen Mary, and so forth.
Inrolled the Twenty-fourth day of May, in the thirty-third year of the
reign of His Majesty King George the Second, 1760.