Improvements in Governors or Apparatus for Regulating the Supply of Steam to Screw Engines on the Rise and Fall of the Screw.
Year: 1890

page_text: Date of Application, 26th Feb., 1890
Complete Specification Left. 18th July, 1890-Accepted, 23rd Aug., 1890
PROVISIONAL SPECIFICATION.
Improvements in Governors or Apparatus for Regulating the Supply
of Steam to Screw Engines on the Rise and Fall of the Screw.
I, BENJAMIN JOSEPH BARNARD MILLS of 23 Southampton Buildings in the County
of Middlesex, Patent Agent do hereby declare the nature of this invention, a com-
munication to me from abroad by Thomas William Quelch Honeywill and Carl
Johannes Edward Linnemann, both of the Town of Hokitika in the County of
Westland, in the Colony of New Zealand, to be as follows:-
The invention has for its object the gradual reduction and restoration of the supply
of steam to screw engines on the rise and fall of the screw.
For this purpose a pendulum is employed in combination with cradle chocks and
suitable connections to shut off the steam as the stern of the vessel is lifted by a wave
and to renew the supply as the stern again sinks in the water by which means the
racing of engines can be obviated whilst no special watch is required on the governor
during the heaviest gales.
The apparatus is constructed somewhat as follows. A heavy metal pendulum is
swung from a beam or other suitable support in such manner as to be capable of move-
ment only in a line with the keel, a wide top bearing or hinge being preferably
employed for this purpose.
Beneath the pendulum is a cradle provided with chocks to limit the motion of the
pendulum, such cradle is mounted on rails and is acted upon by a screw to adjust the
chocks to the distance of travel of the pendulum and the segment to be described
thereby in shutting the throttle valve.
The cradle is so adjusted that the rear chock acts to maintain the pendulum in a
perpendicular position in relation to the keel as the bows rise to a wave whilst the
forward chock permits the pendulum to swing forward as the stern rises.
The forward movement of the pendulum communicates motion by means of a con-
necting rod to a crank or lever attached to the spindle of the main or throttle valve
whereby as the screw rises out of the water the steam is shut off, whilst as the screw
returns to the water and the vessel to a level the valve is opened.
By means of the screw the position of the cradle and chocks can be adjusted to the
greatest nicety, and when the cradle is shifted the length of the connecting rod must
be correspondingly altered, this may be effected by means of a screw coupling.
When not in use the pendulum can be firmnly secured in any convenient manner.
Dated February 26th 1890.
COMPLETE SPECIFICATION.
Improvements in Governors or Apparatus for Regulating the Supply
of Steam to Screw Engines on the Rise and Fall of the Screw.
I, BENJAMIN JOSEPH BARNARD MILLS of 23 Southampton Buildings in the
County of Middlesex Patent Agent do hereby declare the nature of this invention,
a communication to me from abroad by Thomas William Quelch Honey will and
Carl Johannes Edward Linnemann both of the Town of Hokitika, in the County of
Westland in the Colony of New Zealand, and in what manner the same is to be
performed to be particularly described and ascertained in and by the following
statement:-
The invention has for its object the gradual reduction and restoration of the supply
of steam to screw engines on the rise and fall of the screw.

page_text: Figure 1 is a diagram illustrating a governor or apparatus constructed according to
the present invention and Figure 2 is a back view of parts thereof.
X is the main steam pipe, A is a heavy metal pendulum which is swung from a beam B
or other suitable support in such manner as to be capable of movement only in a line
with the keel, a wide top bearing or hinge C being preferably employed for this
purpose. If desired the pendulum may also be guided at its lower end.
Beneath the pendulum A is a cradle D provided with chocks E. E¹ to limit the
motion of the pendulum, such cradle D is mounted on rails and is acted upon by a
screw F to adjust the chocks E E¹ to the distance of travel of the pendulum A and
the segment described thereby in shutting the throttle valve.
The cradle D is so adjusted that the rear chock E acts to maintain the pendulum A
in a perpendicular position in relation to the keel as the bows of the vessel rise to a
wave whilst the forward chock E¹ permits the pendulum to swing forward as the
stern rises but prevents it from travelling beyond the full distance required in that
direction.
The forward movement of the pendulum A communicates motion by means of a
connecting rod G to a crank or lever H attached to the spindle of the main or throttle
valve whereby as the screw rises out of the water the steam is shut off whilst as the
screw returns to the water and the vessel to a level the valve is opened.
By means of the screw F running through the fixed chock E the position of the
cradle D and chocks E. E' can be adjusted to the greatest nicety, and when the
cradle D is shifted, the length of the connecting rod G must be correspondingly altered,
this may be readily effected by means of the screw coupling Gi.
When not in use the pendulum can be firmly secured in any convenient manner I
have thought it unnecessary to represent any method of securing the pendulum when
not in use as such can be readily applied by a competent workman.
A pendulum about 10 feet long and of the weight of about 60 cwt. suspended in a

page_text: ship of 320 feet will have a travel of 9 inches in a sea in which the governor is
required, will work any throttle valve and leave a large margin of power to overcome
friction.
The pendulum instead of working a connecting rod attached directly to the crank H
on the spindle of the main or throttle valve can operate an auxiliary cylinder or
cylinders, or other intermediate machinery which in turn works upon the crank of the
main valve in a similar manner to that adopted in steam steering gear, the pendulum
regulating the action of the whole in which case it may be smaller and lighter than
when acting directly upon the crank of the throttle valve. This employment of
intermediate machinery between the pendulum and throttle valve crank is only
necessary in very long ships in which the forward motion of the pendulum would be
necessarily short and unequal to the task of moving the crank of the throttle or main
valve through such an are of a circle as is required to close the valve in which case
multiplying interme liate gear would therefore be required.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what i
claim is :-
1. In governors or apparatus for regulating the supply of steam to screw engines
on the rise and fall of the screw the employment of a pendulum moving in the direction
of the keel and connected by suitable means with a crank on the main or throttle
valve, substantially as herein shown and described.
2. In governors or apparatus for regulating the supply of steam to screw engines
on the rise and fall of the screw, a pendulum moving in the direction of the keel and
operating the main or throttle valve in combination with an adjustable cradle and
chocks to limit the motion thereof substantially as herein shown and described.
3. In governors or apparatus for regulating the supply of steam to screw engines
on the rise and fall of the screw the peculiar arrangement and combination of parts
substantially as herein shown and described.
B. J. B. MILLS.
By Harris & Mills,
23, Southampton Buildings, London, Agents.