IMPROVEMENTS IN STEAM BOILER SAFETY VALVES
Year: 1859

page_text: LETTERS PATENT to Nathaniel Clayton and Joseph Shuttleworth, of the
City of Lincoln, for the Invention of "IMPROVEMENTS IN STEAM BOILER
SAFETY VALVES."
Sealed the 27th January 1860, and dated the 3rd December 1859:
PROVISIONAL SPECIFICATION left by the said Nathaniel Clayton and
Joseph Shuttleworth at the Office of the Commissioners of Patents,
with their Petition, on the 3rd December 1859.
We, NATHANIEL CLAYTON and JOSEPH. SHUTTLEWORTH, of the City of
Lincoln, do hereby declare the nature of the Invention for "IMPROVEMENTS
IN STEAM BOILER SAFETY VALVES," to be as follows:-
For this purpose a valve kept down on its seat by a spiral spring pressing
upon it is employed, as has heretofore been proposed. According to this
Invention, however, this spiral spring is placed within a tube which is closed
at the bottom, and a projection on the bottom of the tube presses on the top
of the valve; the upper end of the tube is open, and slides within a short tube
which is closed at the top, the upper end of the spiral spring bearing against
the closed top; this latter tube is carried by standards from a ring, which
screws on to a short projecting tube on the top of the boiler, the end of which.
tube is closed by the valve; by this means the spiral spring is protected from
the action of the steam. In order that the driver of the engine may not be
able to alter the pressure on the valve, a portion of the ring above mentioned.
is cut away, and when the ring has been screwed. on to the tube projecting.

page_text: from the boiler, a piece fitting into the notch in the ring is slid over a pro-
jection on the tube into the notch in the ring, and the shackle of a padlock is
placed through a hole in the projection from the tube, so that unless the
padlock is removed, the piece fitting into the notch in the ring cannot be
withdrawn, and the ring cannot be unscrewed from or screwed further on to
the projecting tube.
SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said Nathaniel Clayton and Joseph Shuttleworth in the Great
Seal Patent Office on the 2nd June 1860.
TO ALL TO WHOM THESE PRESENTS SHALL COME, we, NATHANIEL
CLAYTON and JOSEPH SHUTTLEWORTH, of the City of Lincoln, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Third day of December, in the year of our Lord
One thousand eight hundred and fifty-nine, in the twenty-third year of
Her reign, did, for Herself, Her heirs and successors, give and grant unto
us, the said Nathaniel Clayton and Joseph Shuttleworth, Her special licence
that we, the said Nathaniel Clayton and Joseph Shuttleworth, our executors,
administrators, and assigns, or such others as we, the said Nathaniel Clayton
and Joseph Shuttleworth, our executors, administrators, and assigns, should at
any time agree with, and no others, from time to time and at all times there-
after during the term therein expressed, should and lawfully might make,
use, exercise, and vend, within the United Kingdom of Great Britain and
Ireland, the Channel Islands, and Isle of Man, an Invention for "IMPROVE-
MENTS IN STEAM BOILER SAFETY VALVES," upon the condition (amongst others)
that we, the said Nathaniel Clayton and Joseph Shuttleworth, our executors
or administrators, by an instrument in writing under our or their hands and
seals, or under the hand and seal of one of us or them, should particularly
describe and ascertain the nature of the said Invention, and in what manner
the same was to be performed, and cause the same to be filed in the Great
Seal Patent Office within six calendar months next and immediately after the
date of the said Letters Patent.
NOW KNOW YE, that we, the said Nathaniel Clayton and Joseph
Shuttleworth, do hereby declare the nature of the said Invention, and in what
manner the same is to be performed, to be particularly described and ascer-
tained in and by the following statement thereof, that is to say:-
For this purpose a valve kept down on its seat by a spiral spring pressing

page_text: notch in the ring g, and consequently the driver of the engine will not be able
to alter the pressure on the valve h by unscrewing the ring g from or screwing
it further on to the projecting tube a.
In witness whereof, we, the said Nathaniel Clayton and Joseph Shuttle-
worth, have hereunto set our hands and seals, this Thirtieth day of 5
May, in the year of our Lord One thousand eight hundred and sixty.
NATHANIEL CLAYTON.
(L.S.)
JOSEPH SHUTTLEWORTH. (L.B.)
NATHANIEL CLAYTON. (L.S.)
JOSEPH SHUTTLEWORTH. (L.B.)