A NEW OR IMPROVED SWITCH FOR INCREASING OR DIMINISHING THE STRENGTH OF LIGHTING APPARATUS,
Year: 1883

page_text: LETTERS PATENT to Frederick Mori of Leeds in the County of York
Electrician for an Invention of " A NEW OR IMPROVED SWITCH FOR
INCREASING OR DIMINISHING THE STRENGTH OF
LIGHTING APPARATUS,"
CURRENT IN ELECTRIC
PROVISIONAL SPECIFICATION left by the said Frederick Mori at the Office
of the Commissioners of Patents on the 19th January 1883.
FREDERICK MORI of Leeds in the County of York, Electrician
"A NEW OR
IMPROVED SWITCH FOR INCREASING OR DIMINISHING THE STRENGTH OF CURRENT
IN ELECTRIC LIGHTING APPARATUS
"
This invention relates to apparatus for varying the strength of current in electric
lighting apparatus so as to produce different degrees of illumination. For the
purpose of diminishing the strength of the current transmitted to the lamps,
1 employ a series of resisting coils, any or all of which may be introduced into the
main circuit at pleasure and thereby produce as many different degrees of light as
there are coils employed.
The commutator or shunt for introducing or shutting out the said coils consists
of two series of contact makers equal in number to the coils employed and
arranged in two rings or circles upon a disc or plato in the centre of which is a
stud or screw coupled up to the main wire, and on which are mounted two metal
arms corresponding in length to the radius of the circles formed by the contact
makers or terminals. The inner ring of contact makers are simply metal buttons
over which the arm slides, the contact being preserved by the elasticity or spring
thereof but the outer ring consists of metal pins or studs which project an inch or
more from the surface of the plate or disc The arm for connecting these with the
central terminal works on a rule or universal joint and a hole is bored through it
at the outer extremity for receiving the contact pins, perfect contact being ensured

page_text: by means of a binding screw, I thus ensure contact over an area equal to the main
line thus preventing any diminution of current through insufficient conduction
The conducting wires are so coupled that by moving the arms from one peg or
contact maker to another; the resistance coils or one or any number of them may
"E
be included or excluded from the main circuit. The secondary or sliding "shunt
is merely employed to prevent the total stoppage of the current when changing the
main arm from one branch to another.
SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said Frederick Mori in the Great Seal Patent Office on the 19th July
1883.
FREDERICK MORI of Leeds in the County of York, Electrician "A NEW OR
"
IMPROVED SWITCH FOR INCREASING OR DIMINISHING THE STRENGTH OF CURRENT
IN ELECTRIC LIGHTING APPARATUS,"
This Invention relates to apparatus for varying the strength of current in electric
lighting apparatus so as to produce different degrees of illumination.
For the purpose of diminishing the strength of the current transmitted to the
lamps, I employ a series of resisting coils, any or all of which may be introduced
into the main circuit at pleasure, and thereby produce as many different degrees of
light as there are coils employed.
The commutator or shunt for introducing or shutting out the said coils,
consists of two series of contact makers equal in number to the coils employed
and arranged in two rings or circles upon a disc or plate in the centre of
which is a stud or screw coupled up to the main wire; and on which are
mounted two metal arms corresponding in length to the radius of the circles
formed by the contact makers or terminals. The inner ring of contact makers are
simply metal buttons over which the arm slides, the contact being preserved by the
elasticity or spring thereof, but the outer ring consists of metal pins or studs which
project an inch or more from the surface of the plate, or disc. The arm for
connecting these with the central terminal works on a rule or universal joint and a
hole is bored through it at the outer extremity for receiving the contact pins,
perfect contact being ensured by means of a binding screw. I thus ensure contact
over an area equal to the main line thus preventing any diminution of current
through insufficient conduction.
The conducting wires are so coupled that by moving the arms from one peg or
contact maker to another, the resistance coils, or one or any number of them may
be included or excluded from the main circuit.
The secondary or sliding "shunt" is merely employed to prevent the total
stoppage of the current when changing the main arm from one branch to another.
For low resistances I employ an insulating bed into which are screwed two
terminals, two studs, and a contact plate. The main leading wire is cut and each

page_text: end inserted into a terminal or binding screw, one of which communicates directly.
with the contact plate, whilst the other communicates with a central stud"upon
which are mounted a spring contact maker and the arm working upon a universal
joint. One of the studs communicates with the contact plate, the other one being
insulated. To establish the current the arm is first placed upon the insulated stud,
and the spring contact maker or sliding shunt is placed upon its plate and the
current thus enters at one terminal passes to the central stud, through the arm of
the sliding shunt to second terminal. The main arm is then removed from the
insulated stud and placed upon that which is in communication with the contact
plate, and the spring contact maker can then be removed. In this case the use of
the secondary "shunt" is to avoid the passage of sparks between the arm and
studs at the moment of contact and thereby prevent the same from burning away.
I claim Firstly, the employment of a primary arm fitting onto pins of equal
diameter to the main line in combination with a secondary arm or "shunt" for
preventing the stoppage of the current and the fusion or burning of the contact
pins when changing from one branch to the other
Secondly. The combination of a series of resisting coils with a double series of
contact makers as herein described.
In witness whereof I the said Frederick Mori have hereunto set my hand and
seal this eighteenth day of July in the year of our Lord one thousand eight
hundred and eighty three.