IMPROVEMENTS IN REGULATING THE SUPPLY OF STEAM FROM STEAM BOILERS."
Year: 1854

page_text: LETTERS PATENT to Nathan Thompson, junior, of New York, in the
United States of America, for the Invention of "IMPROVEMENTS IN
REGULATING THE SUPPLY OF STEAM FROM STEAM BOILERS."
PROVISIONAL SPECIFICATION left by the said Nathan Thompson at the
Office of the Commissioners of Patents, with his Petition, on the 30th
June 1854.
1, NATHAN THOMPSON, junior, of New York, in the United States of
America, do hereby declare the nature of the Invention for "IMPROVEMENTS IN
REGULATING THE SUPPLY OF STEAM FROM STEAM BOILERS" to be as follows:...
This Invention has for its object means or apparatus for decreasing and
shutting off the supply of steam from a steam boiler when the water in the
boiler is allowed to get too low, and thus to prevent accident to the boiler and
at the same time, by stopping the supply of steam from the boiler, the fact of
the low state of the supply of water to the boiler will be indicated. For this
purpose a float in a steam boiler is caused to act on a throttle or other suitable
valve, in such manner as to close the valve as the water level becomes low,
and completely to close the valve when, the water has become so low as not to
admit of its being much reduced without great liability of injury to the boiler;

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said Nathan Thompson in the Great Seal Patent Office on the
27th December 1854.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, NATHAN
THOMPSON, junior, of New York, in the United States of America, send
greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the. Thirtieth day of June, in, the year of our Lord
One thousand eight hundred and fifty-four, in the eighteenth year of ller
reign, did, for Herself, Her heirs and successors, give and grant unto me,
the said Nathan Thompson, Her special licence that I, the said Nathan
Thompson, my executors, administrators, and assigns, or such others as I,
the said Nathan Thompson, my executors, administrators, and assigns, should
at any time agree with, and no others, from time to time and at all times
thereafter 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 REGULATING THE SUPPLY OF STEAM FROM STEAM BOILERS," upon the
condition (amongst others) that I, the said Nathan Thompson, by an instru-
ment in writing under my hand and scal, 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
Offico within six calendar months next and immediately after the date of the
said Letters Patent.
NOW KNOW YE, that I, the said Nathan Thompson, do hereby declare
the nature of the said Invention, and in what manner the same is to be per-
formed, to be particularly described and ascertained in and by the following
statement thereof (that is to say):-
This Invention has for its object means or apparatus for decreasing and
shutting off the supply of steam from a steam boiler when the water in the
boiler is allowed to get too low, and thus to prevent accident to the boiler, and
at the same time, by stopping the supply of steam from the boiler, the fact of
the low state of the supply of water to the boiler will be indicated. For this
purpose a float in a steam boiler is caused to act on a throttle or other suitable
valve, in such manner as to close the valve as the water level becomes low, and
completely to close the valve when the water has become so low as not to
admit of its being much reduced without great liability of injury to the
boiler.

page_text: the manner of performing the same.
DESCRIPTION OF THE DRAWING.
Figure 1 shows a section of part of a steam boiler; and Figure 2 is an
exterior view of part of the steam chest, showing my improvements applied
thereto. a is a hollow or other float, which is connected by a pin joint to one
end of the lever b, which moves on a pin joint, and is supported by the arm c
fixed to the interior of the boiler; the other end of the lever 6 is connected by
a rod d to a lever arm e, fixed on the axis of the throttle valve f in the steam
pipe 7, which is connected to the interior of the steam chest h, as shown. The
axis of the throttle valve f passes through to the outside of the steam chest,
and has a pointer i enclosed by a glass, and there is a dial to indicate the
position of the float and level of the water in the boiler. j is a stop, to pre-
vent the lever rising so high as to cut off the supply of steam to the steam
pipe g; is the ordinary throttle valve to the steam engine.
Having thus described the nature of my said Invention, and the manner of
performing the same, I would have it understood that I make no claim to any
of the parts separately; but what I claim is, the combination herein described
for regulating the supply of steam from a steam boiler.
In witness whereof, I, the said Nathan Thompson, have hereunto set my
hand and seal, this Twenty-second day of December, in the year of our
Lord One thousand eight hundred and fifty-four.
Witness,
J. BASSET.
NATHAN THOMPSON. (L.S.)