LxPROVEMENTS IN GOVERNING APPARATUS FOR STEAM PROVISIONAL SPFICATION FORTEAM VESSELS
Year: 1882

page_text: LETTERS PATENT to John Dewrance of Great Dover Street in the County
of Surrey and Everden Wimshurst of Grove Road in the County of Middlesex
fan
да
Invention of "LxPROVEMENTS
IN GOVERNING
APPARATUS FOR STEAM
PROVISIONAL SPECIFICATION left by the said John Dewrance and
Everden Wimshurst at the Office of the Commissioners of Patents on the
8th September 1882.
JOHN DEWRANCE of Great Dover Street in the County of Surrey and EVERDEN
WIMSHURST of Grove Road in the County of Middlesex "IMPROVEMENTS IN
GOVERNING APPARATUS FOR STEAM VESSELS
"
This Invention has for its object improvements in governing apparatus for steam
vessels.
Our governing apparatus is intended to control the throttle valve of the engines
when the ship pitches, closing it as the stern rises and uncovers the propeller.
i
We have a vertical tube connected with a cistern which has a free connection
with the sea. The cistern and tube are partly filled with mercury and the
pressure of water forces the mercury from the cistern up the vertical tube and
supports a column corresponding to the height of the water outside. There is a
heavy float on the mercury in the tube which is connected with the throttle valve
by a wire or rod. When the height of water above the propeller diminishes the
mercury in the tube falls and the float closes the throttle valve. Or the float
may be arranged to open a steam or hydraulic valve which controls the throttle
valve.
The apparatus may be hung on trunnions so as to keep it upright when the ship
is rolling.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said John Dewrance and Everden Wimshurst in the Great Seal Patent
Office on the 8th March 1883.
JOHN DEWRANCE of Great Dover Street in the County of Surrey and EVERDEN
WIMSHURST of Grove Road in the County of Middlesex "IMPROVEMENTS IN
GOVERNING APPARATUS FOR STEAM VESSELS
This Invention has for its object improvements in governing apparatus for steam
vessels.
Our governing apparatus is intended to control the throttle valve of the engines
when the ship pitches, closing it as the stern rises and uncovers the propellor.
We have a vertical tube connected with a cistern which has a free connection
with the sea.
The cistern and tube are partly filled with mercury and the pressure of water
forces the mercury from the cistern up the vertical tube and supports a column
corresponding to the height of the water outside.
There is a heavy float on the mercury in the tube which is connected with the
throttle valve by a wire or rod.
When the height of water above the propellor diminishes the mercury in the
tube falls and the float closes the throttle valve. Or the float may be arranged to
open a steam or hydraulic valve which controls the throttle valve.
The apparatus may be hung on trunnions so as to keep it upright when the
ship is rolling.
The apparatus is shown in section by the annexed drawing.
a is a cistern or chamber with a sea connection at a¹ and closed at the top by a
cover. b is a tube cast in one piece with the cover and dipping down into the
cistern a.
c is mercury contained in the cistern and tube. d is a cast iron float
resting on the mercury in the tube. d¹ is the stem of the weight passing up
e is a wire attached to the stem d' and
through a guide tube on the cover.
connected with the throttle valve so as to close it when the float falls and open it
when the float rises. f is a guide pulley.
The apparatus is fixed at the level of the shaft at the end of the screw tunnel
so that the head of water when the screw propeller is immersed, presses on the
surface of the mercury in the outer cylinder or jacket and forces it up in the inner
cylinder to a height about as many inches as there are feet of water above the
centre of the screw shaft. Immediately the water begins to uncover the propeller
the iron float falls with the mercury and by means of a wire cord closes the
throttle valve in proportion to the extent the propeller is uncovered.
What we claim is :-
Our governing apparatus for steam vessels in which the external water is made
to sustain a column of mercury carrying a float connected with the throttle valve
of the engine substantially as described.
In witness whereof I the said John Dewrance have hereunto set my hand
and seal this seventh day of March in the year of our Lord One thousand
eight hundred and eighty three.