AN IMPROVED GOVERNOR FOR MOTIVE POWER ENGINES
Year: 1873

page_text: LETTERS PATENT to Thomas Fawcett, of Dewsbury, in the County of
York, Timber Merchant, and James Coulter, of the same Place,
Engineer and Machinist, for the Invention of "AN IMPROVED GOVERNOR
FOR MOTIVE POWER ENGINES."
COMPLETE SPECIFICATION filed by the said Thomas Fawcett and
James Coulter at the Office of the Commissioners of Patents, with
their Petition and Declaration, on the 15th January 1873, pursuant
to the 9th Section of the Patent Law Amendment Act, 1852.
TO ALL TO WHOM THESE PRESENTS SHALL COME, we, THOMAS
FAWCETT, of Dewsbury, in the County of York, Timber Merchant, and
JAMES COULTER, of the same Place, Engineer and Machinist, send
greeting.
WHEREAS we are in possession of an Invention for
"AN IMPROVED
GOVERNOR FOR MOTIVE POWER ENGINES," and have petitioned Her Majesty
to grant unto us, our executors, administrators, and assigns, Her Royal
Letters Patent for the same and have made solemn Declaration that we
are the true and first Inventors thereof.

page_text: NOW KNOW YE, that we, the said Thomas Fawcett and James
Coulter, do hereby declare that the following Complete Specification,
under our hands and seals, fully describes and ascertains the nature of
the said Invention, and in what manner the same is to be performed, in
and by the following statement (that is to say) :-
This Invention relates to that class of governors for motive power
engines for which Letters Patent dated the Twenty-first day of December
1871, and No. 3461 were granted to the aforesaid Thomas Fawcett and
James Coulter, and the present improvements are as follows:-
In lieu of a weight or weights described in the Specification referred to
as being applied to the valve rod, we employ, by preference, a spiral
spring (or a spring of other form may be employed) by means whereof
and an adjusting nut or screwed hand wheel the governor can be
adjusted for the speed at which the engine is required to run. A finger
or pointer applied near the adjusting nut or hand wheel indicates on a
graduated scale the speed of the engine. These improvements are
specially designed for the governors of marine engines, but are applicable
to governors of this class generally.
Such being the nature and object of this Invention, we will now
proceed to describe the same in detail, and in order that the improve-
ments may be clearly understood we have hereunto annexed a Sheet of
Drawings and have marked the same with figures and letters of
reference.

page_text: by noting the speed at the various pressures or points on the spring B,
and when marked it is afterwards only necessary to turn the pointer
opposite the mark or number on the scale equal to the speed required.
We have here shewn and described a spiral spring applied, such being
what we consider the best form of spring for this purpose, but it will be
evident that other forms may be applied.
Having thus fully described the nature and particulars of this our
said Invention, together with the manner in which the same is to be or
may be performed or carried into practical effect, we would have it.
distinctly understood that we claim as of our Invention,―
Firstly. The application to governors of this class of a spring instead
of a weight with means for adjusting the same to the speed the engine is
required to run.
Secondly. We claim the indicator as and for the purpose herein
described and illustrated.
In witness whereof, we, the said Thomas Fawcett and James
Coulter, have hereunto set our hands and seals, this Eleventh
day of January, in the year of our Lord One thousand eight
hundred and seventy-three.