s.
Year: 1887

page_text: Date of Application, 11th Nov., 1887
Complete Specification Left, 13th Aug., 1888
Complete Specification Accepted, 28th Sept., 1888
Engines.
I EDWARD JONES of 13 Blenheim Square Leeds in the County of York Mechanical
Engineer do hereby declare the nature of this invention to be as follows:-
This invention relates more particularly to controlling the speed of the engines used
for driving dynamo electric machines, but it is equally applicable to steam engines
generally, the objects of the invention being either to electrically and automatically
vary the speed of the engine according to the electro motive force of the current it is
required to produce, or to maintain a constant speed of the engine under varying
loads.
To explain the expression "the EMF of the current required," I would cite
the following example:-Let us suppose in an installation twenty lamps are at
work, and I cut out ten of the lamps, it will be evident that the EMF of the current
required to work ten lamps will be considerably less than that required to work the
twenty consequently I must reduce the speed of the engine and the dynamo
machine, so that the latter will produce less current and vice versa.
In carrying out my invention so as to vary the speed of the engine according to
requirements, I insert, at any convenient part of the main circuit, an electro magnet
or magnets and two contact pieces. Above the magnets I place an armature, the
normal position of which is maintained equi-distant between the contact pieces by a
spring or other means adjusted so as to counter-balance a given magnetic force of the
electro magnet. The armature of the magnet is connected with one of the leads of
an electro motor, which is placed upon the engine, or in any other convenient position,
and is connected with the stop or throttle valve thereof, the other lead from the electro
motor being joined to the main circuit.
When the magnetic force of the magnet exceeds the normal quantity, which it
would do should any of the lamps in the circuit be cut out, the magnet will overcome
the resistance of the spring, and pull the armature against one of the contact pieces.
Part of the main current would thus be diverted, and would pass through the motor on

page_text: the engine, causing it to rotate in one direction. As the motor is connected with the
throttle valve of the engine by means of a rack and pinion, or in any other suitable
manner, the valve would, by the action of the motor, be more or less closed, and the
speed of the engine and the electric generator would be reduced until such time as the
current became again normal.
The contact would then be broken by the spring re-exerting its power and over-
coming the magnetism of the electro magnet, and the motor would remain at rest so
long as the current did not vary.
In like manner, should the E M F of the current become weakened by the
introduction of additional lamps, or from other causes, then the balance between
the spring and the magnet would be disturbed, and the spring being the
stronger, would pull the armature against the second contact piece. This
contact piece is arranged in such a manner as to send a portion of the current through
the electro motor in the opposite direction to that previously mentioned, the effect of
which will be to open the throttle valve and admit more steam to the engine, which
will thus be driven at an increased speed, and the EMF of the current will be
increased until normal conditions are restored, and the equilibrium of the armature
again established.
When applying the invention to the purpose of regulating the speed of an engine
and maintaining it constant under varying loads, in place of exciting the electro
magnet by a shunt from the main circuit, as above described, I employ a small
dynamo electric machine driven by the engine for that purpose; the other parts of
the apparatus remaining unaltered, any variation in the speed of the engine will cause a
variation in the current round the magnet, and thereby operate the parts precisely
as in the first described arrangement.
It will be understood that suitable resistances will be employed to ensure the proper
working of the apparatus.
Dated this 11th day of November 1887

page_text: Improved Means for Electrically Controlling the Speed of Steam
Engines.
I EDWARD JONES of 13 Blenheim Square, Leeds, in the County of York, Mechanical
Engineer, do hereby declare the nature of this invention and in what manner the
same is to be performed, to be particularly described and "ascertained in and by the
following statement :-
This invention relates more particularly to controlling the speed of the engines used
for driving dynamo-electric machines, but it is equally applicable to steam engines
generally, the objects of the invention being either to electrically and automatically
vary the speed of the engine according to the electro-motive force of the current it is
required to produce, or to maintain a constant speed of the engine under varying
loads.
To explain the expression "the EMF of the current required," I would cite the.
following example -Let us suppose in an installation twenty lamps are at work, and
I cut out ten of the lamps; it will be evident that the EM F of the current required
to work ten lamps will be considerably less than that required to work the twenty, con-
sequently I must reduce the speed of the engine and the dynamo machine, so that the
latter will produce less current, and vice versa.
According to my invention, the means I use for electrically controlling steam
engines consists of,-
1st. A Controller, for deciding the direction of the current to the electric motor.
2nd. An electric motor.
3rd. A balanced steam valve for regulating the admission of steam to the engine
actuated by the electric motor.
In the accompanying drawings,
Sheets I and II show the Controller.
Fig. 1 is a plan.
Fig. 2 is a side elevation.
Fig. 3 is an end elevation.
A is the base formed of wood or other non-conducting material.
B is an upright plate, also of non-conducting material.
Cis an electro magnet coiled with cable, forming part of the main conductor..
D is an armature secured at one end by a spring.
E is an adjustable arm, carrying a spring E' for controlling the armature D.
FF' are two adjustable platinum pointed contact screws.
G is a spring switch for switching controller out of circuit.
HH is the main conductor.
11 are the conductors leading to the electric motor.
JJ are resistances for shunting part of the main current through the electric
motor.
Ka metal bar connecting the two resistances.
The mode in which the controller operates is as follows
The current enters at the conductor H, passes around the coils of the electro
magnet C, then through the resistance J, the metal bar K, through the resistance J³,
to the conductor H¹.

page_text: bar is, through the conductor 1, to the armature of the motor, which current returning
by the conductor I, passes along the armature D) to the screw F', and so to the
conductor H¹.
Sheets III, IV and V show the electric motor and Steam Valve.
Fig. 1 is a plan.
Fig. 2 is a side elevation.
Fig. 3 is an end elevation.
A is the casting, forming the valve seating and the bracket for carrying the electric
motor and gear.
B is a sliding cylindrical piston valve with a toothed rack attached to one end.
Cis a shaft carrying a pinion at one end gearing into the rack of the valve B.
D is a worm wheel on shaft C.
E is a worm on the end of armature spindle of electric motor.
F is armature of electric motor.
G G¹ are the brushes bearing on the commutator of the electric motor.
HH' are the terminals connected with the brushes, and also connected to the con-
troller, by the conductors I and I¹ on Sheet 1.
M M' are the field magnets of the motor, always excited with the same polarity,
from any convenient source. The field magnets of the motor always being of the
same polarity, it will be seen that when the controller causes a current to be sent
in one direction through the armature of the motor, the said armature will rotate,
and if the current is sent in the reverse direction, the armature will reverse its
direction of rotation, and the valve, through the intermediate gearing, will be more
or Cess closed or opened, according to the direction of rotation of the armature,
which will always continue to work in one or other direction till the normal current
is established and the spring armature of the controller remains poised between the
two contact screws.
It will be obvious that any kind of controller that will change the direction of the
current will be suitable, and that any kind of motor that will run in either direction
will be suitable, and that any kinds of balanced valves will be suitable.
This apparatus is also applicable to the governing of Turbines or other prime
movers.
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 :-
The combination of a controller actuated by the current it has to control, with an
electric motor and with a valve for regulating the supply of fluid to the motive power
engine, according to the speed required to supply the proper or normal current of
electricity.