Improvements in Weighing Machines.
Year: 1888

page_text: Date of Application, 3rd Aug., 1888
Complete Specification Left, 3rd June, 1889-Accepted, 6th July, 1889
PROVISIONAL SPECIFICATION.
Improvements in Weighing Machines.
I WILLIAM SNELGROVE of Bankwood, Church Road, Moseley in the County of
Worcestershire, Engineer do hereby declare the nature of this invention to be as
follows:-
My invention relates more particularly to weighing machines described in the
specification to Letters Patent No. 7335 of 1887 granted to me and its object is to
improve the accuracy of action and the mechanism of such weighing machines.
In these machines a movable poise is arranged upon a weigh beam or steel-yard and
it is automatically actuated by electrical power, so that, when no load is upon the
placed
weighing pan or platform the poise remains at the zero point but when a load
upon it, electrical contacts are made, causing the poise to be moved to the position
where the beam or steel-yard is in equilibrium.
When such equilibrium is attained the contact: are separated and the poise ceasing
its movement remains stationary at a position upon the steel-yard which indicates the
weight of the load.
Whenever the load is removed other contacts are again made which causes the
electrical power to return the poise again to zero, to be ready for another weighing.
when wanted.
My present invention relates principally to the means of actuating the poise
electrically and securing that it shall stop accurately at the required position; to
the means of securing the return of the poise, to the zero point upon the beam or
steel-yard; and to the use of two or more poises actuated electrically.
When great accuracy is required in weighing, it is advisable to use at least two
poises, a heavy one, and a light one; the heavy one serves to indicate the greater
units of weight, while the light one indicates the smaller. Both poises move along
the beam or steel-yard by electrical power, and inay conveniently be actuated by one
stationary rotary electro-motor attached to any point of the beam or steel-yard.
This motor is driven in one direction only by the electric current and its power is used
to actuate the poises when they travel from the knife edge fulcrum end to the free or
vibrating end of the steel-yard, their return is secured by springs which are compressed,
put in tension, or coiled up by the outward movement, and pawls are provided to fall
into ratchet teeth, to prevent premature return.
One arrangement and its action is as follows :-
A rotary electro-motor is attached at a convenient point to the steel-yard, the poises
are constructed in the form of long rods or racks, suitably carried and guided having
teeth on the under sides gearing into driving pinions; the upper sides have teeth also ;
but of ratchet shape with pawls pivoting from the steel-yard falling into them.
When both poises are at the zero point, then a load placed upon the pan or plat-
form, at once causes the steel-yard to rise and an electric circuit is completed, the
current flows to the motor and passes through an electro-magnet which attracts an
armature moving the lever to which it is attached and causing a clutch to connect the
electro-motor spindle to the driving pinion of the light poise rack.
The poise rack commences to move out towards the free end of the steel-yard and,
if at any portion of its travel, its weight is sufficient to move the steel-yard from
contact with the upper part of the carrier, then the circuit is interrupted, a spring
pulls back the armature from the electro-magnet and throws the clutch, connecting the
driving pinion and the motor, out of action. The poise rack would then return to
zero, propelled by the return spring; but for the pawl which falling into the ratchet,
holds it stationary. The machine is now in equilibrium and the position of the poise
indicates the weight of the load. When the load is taken off, the steel-yard falls

page_text: .
(because of the position of the poise) and touching the lower contact of the carrier,
a circuit is completed which furnishes electrical power to lift the pawl and allow the
poise rack to return to its zero point. The machine is then ready to weigh again.
When both poises are again at the zero point and a weight is placed, upon the pan
or platform of the machine, which is greater than the smaller poise when fully out can
balance the first action is the same as hereinbefore described, the light poise rack
moves out; but it completes its entire travel, and by interrupting at the end of its
travel the circuit through the electro-magnet holding in the clutch, which connects its
own driving pinion with the motor, releases that clutch and stops, at the same time
it shunts the current through an electro-magnet which actuates a clutch connecting
the electro-motor spindle with the driving pinion of the large poise rack, the large
poise therefore moves out until the steel-yard falls, when the circuit is again inter-
rupted and the clutch thrown out of action, by the release of the armature from the
electro-magnet.
The spring resisting the movement of the larger poise tends to return it to the zero
end of the steel-yard scale; but a pawl falling into ratchet teeth upon the top of the
rack prevents this. As each ratchet tooth of the heavy poise rack represents a con-
siderable weight and the poise having a slight momentum, it will generally happen
that the heavy poise will go a little too far and overbalance the steel-yard causing it to
rest on the lower part of the carrier, the current will then release the light poise rack
pawl and the poise will return, propelled by the return spring 'till the steel-yard end
rises and breaking contact allows the pawl to fall on again.
-The-readings-on the scale or scales of the steel-yard now give the correct weight in
the usual manner.
Instead of the arrangement herein before described, the electro-motor may he
arranged to continue running, and in one direction, and the current may always pass
to it, the action of the contacts carried upon the end of the steel-yard, and the carrier
may be used only to interrupt and shunt the current, exciting the necessary electro-
magnets which are required to control the clutches and lift the pawls.
The smaller poise rack at the outer end of its travel controls the direction of the
current by suitably arranged contacts. In the cases of both poises, arrangements are
made to disconnect the electro-motor from their driving pinions at the extreme out
end of the travel to prevent danger of over-running or other damage.
Under some circumstances a simpler arrangement suffices, only one poise rack is
used and it is supported and returned to zero by a spring, as hereinbefore described,
it has a ratchet rack as well as the ordinary toothed rack and the rotating electro-
motor is replaced by reciprocating one which is arranged to advance the poise rack
by one tooth at each reciprocation.
One tooth may correspond to one division of the steel-yard scale. The reciprocating
motor consists simply of a lever pivoted on a frame which is attached to the steel-yard
at any convenient place, this lever has an armature and an electro-magnet.
A spring pulls the lever and arunature from the electro-magnet and contacts, are
arranged so that the current excites the electro-magnet which attracts the armature
until it moves near the magnet, when the circuit is interrupted and the spring pulls
back the lever to make contact again, and so on.
The lever thus moves to and fro within fixed limits, and it actuates a pawl falling
into the ratchet teeth and advancing the poise rack one tooth at each forward move-
ment. A holding pawl falls into tooth after tooth and so prevents the rack slipping
back under the action of the return spring, while the actuating pawl is making its
return stroke preparatory to seizing another tooth. The current passes and excites
the electro-motor magnets whenever the end of the steel-yard touches the upper part
of the carrier and the poise rack continues to travel out tooth by tooth until it
counterbalances, and the circuit is thereby interrupted.
From the step by step nature of the action of this motor, the interruption of the
current is all that is necessary to cause the immediate pause of the poise at the precise
tooth where the machine is in equilibrum. When the load is removed, the steel-yard
end falls upon the lower contact of the carrier and a current passes, which exciting an

page_text: electro-magnet actuates an armature and lever, and lifts out both driving and holding
pawls from the ratchet teeth.,
The poise rack then returns to zero under the action of the return spring as herein-
before described.
Two or more poises may also be used, driven by reciprocating electro-motors.
When two poises
are used, a light, and a heavy one, the action in weighing is similar
to that herein before described when a rotatory motor furnished the propelling power.
The contacts made and interrupted by the movement of the end of the steel-yard
hetween the top and bottom of the carrier pass the current either to the motor of the
light poise, or to the electro-magnets withdrawing the pawls from the light poises.
In this way the light poise first moves out on the steel-yard, then if necessary the
heavy poise, actuated by a circuit through contacts made at the termination of the
light poise's movement; and if in its step by step action it overbalances the steel-yard
then the bottom contact passes the current which lifts the pawls off the light poise
ratchet and it returns till balancing is accomplished when the pawls fall on again.
The two positions then indicate the weight of the load.
It may sometimes happen in using poises, especially the heavier poises, in the
manner described herein, that a movement of half or other fraction of a tooth may
overbalance the steel-yard and therefore interrupt the circuit; in this case as the
power is at once withdrawn from the motors, the return spring may force the poise
back again to the beginning of the tooth where it is arrested by the holding pawl and
so allow the steel-vard to rise again to the upper contact.
This action might continue and set up a vibratory motion of the steel-yard and
cause delay in weighing.
To prevent this it may be arranged that in reciprocating motors the spring pulling
the lever and armature from the electro-magnet gives the effective stroke while the
attraction of the magnet only gives the back stroke to seize another tooth. When
this is done, it follows that if the current once causes the actuating pawl to seize a
tooth, that tooth will be driven forward the full predetermined distance whether the
current continues during the movement of the poise or not.
The heavy poise will therefore always overbalance the steel-yard and allow the finer
adjustment to be made by the consequent return of the light poise.
A weighted lever, it is obvious may be used as an equivalent for the spring in the
motor.
When this vibratory action occurs with the rotary motor, the driving pinion may be
replaced by a driving lever and pawl, and the lever may be caused to reciprocate by
a cam or equivalent contrivance on the pinion spindle, the lever being moved in one
direction by the cam, and the acting stroke, on the return, accomplished by the energy
of a spring or weight.
In this manner if the pawl catches a tooth it is compelled to move that tooth
through its full predetermined travel whether the clutch connecting to the motor be
thrown out or not while it is moving.
A spring or, weight therefore moves the lever and pawl through its effective stroke
and the can only compresses the spring or lifts the weight.
In the modifications of electrical power gear herein before described, the electrical
power is used to move the poise or poises upon their travel from the fulcrum end of
the steel-yard to the free or vibrating end, and the return movement is accomplished
by the force stored up in a spring by the outward movement.
That is part of the work of the electro-motor during the outward travel is stored
op in a spring to secure the return.
This spring may be of any convenient kind, tension, compression, or coiling; or a
weight may be adapted to do the work; but I prefer to use helical springs coiling
inside hollow pinions on which the rack is supported, the movement of the rack in
one direction coils up these springs and they are then ready to return the energy
when required.
To secure uniformity of the impelling force, upon the return travel, the fusee
arrangement common to watches may be adopted..

page_text: Arrangements of stationary racks and rotary motors forming part of the movable
poise have already been described in specification to Letters Patent No. 7335 of 1887
granted to me; but stationary ratchet racks with movable reciprocating motors
forming part of movable poises may also be used with arrangements substantially as
described and suitable insulated conductors.-
Instead of using the electrical power to propel the poises on their outward travel or
movement towards the free end of the steel-yard, the electrical power might be used
to accomplish the inward movement or travel from the free end towards the fulcrum,
and then the springs put in action by that movement would be available for the out-
ward movement, and arrangements would be similar to those herein before described
for arresting the outward motion at the required positions.
To check too rapid movement of poises on either travel, dash-pots, brakes, cataracts,
or any well known similar contrivances may be utilized.
These improvements may be applied to many forms of weighing machines or
balances.
The electric current required to supply the electro-motors and electro magnets may
be furnished from any convenient form of battery, or it may be generated by a
dynamo machine driven in any convenient manner.
be
- The consumption of metal in the battery by local action, while not in use, may
prevented by a suitable lever or winding arrangement to withdraw the metal plates
from the exciting liquid when the machine is not required for weighing.
The arrangement may be made automatic, or it may be connected to the discon-
necting lever in common use on weighing machines.
Recording mechanism may be used in conjunction with the movements of the
poises to record on dials or other contrivances the weight indicated by the poises.
Dated this 2nd day of August 1888.
MARAS & CLERK,
Agents for Applicant.
COMPLETE SPECIFICATION.
Improvements in Weighing Machines.
I WILLIAM SNELGROVE of The Nest King's Norton in the County of Worcester-
shire, 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:-
My invention relates more particularly to weighing machines described in the
specification to Letters Patent No 7335 of 1887 granted to me, and its object is to
improve the accuracy of action and the mechanism of such weighing machines.
In these machines a movable poise is arranged upon a weigh beain or steelyard
and it is automatically actuated by electrical power, so that when no load is upon the
weighing pan or platform the poise remains at the zero point but when a load is
placed upon it, electrical contacts are made, causing the poise to be moved to the
position where the beam or steelyard is in equilibrium.
When such equilibrium is attained the contacts are seperated and the poise ceasing
its movement remains stationary at a position upon the steelyard which indicates the
weight of the load.
Whenever the load is removed other contacts are again made which causes the
_electrical power to return the poise again to zero, to be ready for another weighing
when, wanted.
My present invention relates principally to the means of actuating the poise
electrically and securing that it shall stop accurately at the required position; to the
means of securing the return of the poise to the zero point upon the leam or steel-
yard and to the use of two or more poises actuated electrically.
When great accuracy is required in weighing, it is advisable to use at least two
poises, a heavy one and a light one, the heavy one serves to indicate the greater units

page_text: of weight while the light one indicates the smaller. Both poises move along the
beam or steelyard by electrical power and may conveniently be actuated by one
stationary rotary electro-motor attached to any point of the beam or steelyard,
The mortor is driven in one direction only by the electric current and its power
is used to actuate the poises when they travel from the knife edge fulcrum end to the
free or vibrating end of the steelyard their return is secured by springs which are
compressed, put in tension, or coiled up by the outward movement and pawls are
provided to fall into ratchet teeth to prevent premature return.
One arrangement and its action is as follows:
-
A rotary electro-motor is attached at a convenient point to the steelyard, the poises
are constructed in the form of long rods or racks, suitably carried and guided, having
teeth on the undersides gearing into driving pinions; the upper sides have teeth
also; but of ratchet shape with pawls pivoting from the steelyard falling into them.
When both poises are at the zero point then a load placed upon the pan or platform,
at once causes the steelyard to rise and an electric circuit is completed, the current
flows to the inctor and passes through an electro magnet which attracts an armaturo
moving the lever to which it is attached and causing a clutch to connect the electro
motor spindle to the driving pinion of the light poise rack.
The poise rack commences to move out towards the free end of the steelyard and
if at any portion of its travel, its weight is sufficient to move the steelyard from the
contact with the upper part of the carrier then the circuit is interrupted; a spring
pulls back the armature from the electro magnet and throws the clutch connecting the
driving pinion and the motor ont of action. The poise rack would then return to
zero, propelled by the return spring but for the pawl which falling into the ratchet,
holds it stationary. The Machine is now in equilibruin and the position of the poise
indicates the weight of the load. When the load is taken off, the steelyard falls
(because of the position of the poise) and touching the lower contact of the carrier,
a circuit is completed which furnishes electrical power to lift the pawl and allow the
poise rack to return to its zero point.
-
The machine is then ready to weigh again.
ģ
When both poises are again at the zero point and a weight is placed upon the pan
or platform of the machine, which is greater than the smaller poise when fully out
can balance the first action is the same as herein before described, the light poise
rack moves out; but it completes its entire travel, and by interrupting at the end of
its travel the circuit through the electro magnet holding in the clutch, which connects
its own driving pinion with the motor, releases that clutch and stops, at the same
time it shunts the current through an electro magnet which actuates a clutch con-
necting the electro motor spindle with the driving pinion of the large poise rack;
the large poise therefore moves out until the steelyard falls when the circuit is again
interrupted and the clutch thrown out of action, by the release of the armature from
the electro-magnet.
The spring resisting the movement of the larger poise tends to return it to the
zero end of the steelyard scale but a pawl falling into ratchet teeth upon the top of
the rack prevents this.
As each ratchet tooth of the heavy poise rack represents a considerable weight and
the poise having a slight momentum, it will generally happen that the heavy poise
will go a little too far and overbalance the steelyard causing it to rest on the lower
part of the carrier, the current will then release the light poise rack pawl and the
poise will return, propelled by the return spring till the steelyard end rises and
breaking contact allows the pawl to fall on again.
The readings on the scale or scales of the steelyard now give the correct weight
in the usual manner.
Instead of the arrangement herein before described, the electro-motor may be
arranged to continue running, and in one direction, and the current may always pass
to it, the action of the contacts carried upon the end of the steelyard, and the carrier
may be used only to interrupt and shunt the current, exciting the necessary electro
magnets which are required to control the clutches and lift the pawls.

page_text: The smaller poise rack at the outer end of its travel controls the direction of the
current by suitably arranged contacts. In the case of both poises arrangements are
made to disconnect the electro motor from their driving pinions at the extreme out
end of the travel to prevent danger of over running or other damage.
Under some circumstances a simpler arrangement suffices, only one poise rack is
used and it is supported and returned to zero by a spring as hereinbefore described it
has a ratchet rack as well as the ordinary toothed rack and the rotating electro-
motor is replaced by reciprocating one which is arranged to advance the poise rack
by one.tooth at each reciprocation. .
One tooth may correspond to one division of the steelyard scale. The reciprocating
motor consists simply of a lever pivoted on a frame which is attached to the steelyard
at any convenient place, this lever has an armature and an electro magnet.
A spring pulls the lever and armature from the electro magnet and contacts are
arranged so that the current excites the electro magnet which attracts the armature
until it moves near the magnet, when the circuit is interrupted and the spring pulls
back the lever to make contact again and so on.
The lever thus moves to and fro within fixed limits, and it actuates a pawl falling
into the ratchet teeth and advancing the poise rack one tooth at each forward move-
ment. A holding pawl falls into tooth after tooth and so prevents the rack slipping
back under the action of the return spring, while the actuating pawl is making its
return stroke preparatory to seizing another tooth. The current passes and excites
the electro-motor magnets whenever the end of the Steelyard touches the upper part
of the carrier and the poise rack continues to travel out tooth by tooth until it
counterbalances, and the circuit is thereby interrupted.
From the step by step nature of the action of this motor, the interruption of the
current is all that is necessary to cause the immediate pause of the poise at the
precise tooth where the machine is in equilibrium.
When the load is removed, the Steelyard end falls upon the lower contact of the
carrier and a current passes, which exciting an electro magnet actuates an armature
and lever, and lifts out both driving and holding pawls from the ratchet teeth.
The poise rack then returns to zero under the action of the return spring as
herein before described.
Two or more poises may also be used driven by reciprocating electro motors.
When two poises are used, a light and a heavy one, the action in weighing is similar
to that hereinbefore described when a rotary motor furnished the propelling power.
The contacts made and interrupted by the movement of the end of the. Steelyard
between the top and bottom of the carrier pass the current either to the motor of
the light poise or to the electro magnets withdrawing the pawls from the light
poises.
In this way the light poise first moves out on the steelyard then if necessary the
heavy poise, actuated by a circuit through contacts made at the termination of the
light poise's movenient; and if in its step by step action it overbalances the Steol-
yard then the bottom contact passes the current which lifts the pawls off the light
poise ratchet and it returns till balancing is accomplished when the pawls fall on
again. The two positions then indicate the weight of the load.
It may sometimes happen in using poises, especially the heavier poises, in the
manner described herein, that a movement of half or other fraction of the Tooth may
overbalance the Steelyard and therefore interrupt the circuit; in this case as the
power is at once withdrawn from the motors, the return spring may force the poise
back again to the begining of the tooth where it is arrested by the holding pawf and
so allow the Steelyard to rise again to the upper contact.
This action might continue and set up a vibrating motion of the Steelyard and
cause delay in weighing,
To prevent this it may be arranged that in reciprocating motors the Spring pulling
the lever and armature from the electro magnet gives the effective stroke while the
attraction of the magnet only gives the back stroke to seize another tooth. When
this is done, it follows that if the current once causes the actuating pawl to seize a

page_text: tooth, that tooth will be driven forward the full predetermined distance whether the
current continues during the movement of the poise or not.
The heavy poise will therefore always overbalance the steelyard and allow the finer
adjustment to be made by the consequent return of the light poise.
A weighted lever, it is obvious may be used as an équivalent for the spring in the
motor.
When this vibrating action occurs with the rotary motor, the driving pinion may be
replaced by a driving lever and pawl, and the lever may be caused to reciprocate by
a cam or equivalent contrivance on the pinion spindle, the lever being moved in
one direction by the cam, and the acting stroke, on the return, accomplished by
the
ernergy of a spring or weight.
In this manner if the pawl catches a tooth it is compelled to move that tooth
through its full predetermined travel whether the clutch connecting to the motor
be thrown out or not while it is moving.
A spring or weight therefore moves the lever and pawl through its effective
stroke and the cam only compresses the spring or lifts the weight.
In the modifications of electrical power gear herein before described, the electrical
power is used to move the poise or poises upon their travel from the fulcrum end
of the Steelyard to the free or vibrating end, and the return movement is accom-
plished by the force stored up in a spring by the outward movement. That is, part
of the work of the electro-motor during the outward travel is stored up in a spring
o secure the return. This spring may be of any convenient kind_tension, com-
pression or coiling, or a weight may be adapted to do the work, but I prefer to use
helical springs coiling inside hollow pinions on which the rack is supported, the
movement of the rack in one direction coils up these springs and they are then ready
to return the energy when required.
To secure uniformity of the impelling force, upon the return travel, the fusee
arrangement common to watches may be adopted.
Arrangements of stationary racks and rotary motors forming part of the movable
poise have already been described in Specification to Letters Patent No. 7335 of
1887 granted to me; but Stationary ratchet racks with movable reciprocating
motors forming part of moveable poises may also be used with arrangements sub-
stantially as described and suitable insulated conductors.
Instead of using the electrical power to propel the poises on their outward travel
or movement towards the free end of the steelyard, the electrical power might be
used to accomplish the inward movement or travel from the free end towards the
fulcrum, and then the Springs put in action by that movement would be available
for the outward movement, and arrangements would be similar to those hereinbefore
described for arresting the outward motion at the required positions.
To check too rapid movement of poises on either travel, dash pots, brakes, cataracts,
or any well known similar contrivances may be utilized.
These improvements may he applied to many forms of weighing machines or
balances.
The electric current required to supply the electro motors and the electro magnets
may he furnished from any convenient form of battery, or it may be generated by a
dynamo machine driven in any convenient manner.
The consumption of metal in the battery by local action, while not in use, may be
prevented by a suitable lever or winding arrangement to withdraw the metal plates
from the exciting liquid when the machine is not required for weighing.
The arrangement may be made automatic or
lever in common use on weighing machines.
may be connected to the disconnecting
Recording mechanism may be used in conjunction with the movements of the poises
to record on dials or other contrivances the weight indicated by the poises.
And in order that my Invention may be fully understood and readily carried into
effect I hereunto append 5 sheets of explanatory drawings, to be hereinafter referred
to and showing examples of my electric weighing Machine.
The whole of the drawings on Sheets 1. 2 and 3 relate to that arrangement of my

page_text: invention in which I use a stationary rotary electro-motor attached to the Steelyard and
revolving in one direction only and show my electric weighing machine as constructed
to use three poises. In this machine also two batteries are used one for the purpose
of actuating the motor and the other to supply current necessary to control the
clutches and lift the pawls as herein before described.
Upon sheets and 5 are shewn various details and modifications when reciprocating
electro motors are used and when two poises are employed.
On Sheet 1 Figure 1 is a side elevation of my electric weighing machine which
has had the ends of the steel yard broken off to allow of a sufficiently large scale;
those ends are shown directly underneath at Figures 3 and 5. Figure 2 is a longi-
tudinal section showing details of poises and their driving mechanism, pawls and
coiling return springs as well as the electrical contact levers for interrupting and
changing the direction of the currents used to excite the electro magnets required.
Figures 4 and 6 are sections of the ends of the Steelyard.
On Sheet 2. Figure 7. is a plan of the portion shown in elevation at Figures 1 and
Figures 8 and 9 plans of the ends shown in elevation at Figures 3 and 5. Figure 10
is a transverse section through the machine to show. the spring pinions used for
returning the poise rack to the fulcrum ends of their travel and Figure 11 is a
transverse section through A. B. to show the action of the clutch withdrawing electro
magnets and the clutches.
On Sheet 3 Figure 12 is a sectional elevation partly diagramatic to illustrate
clearly the arrangement of wires conducting the electric currents required to perform
the various operations. Figure 13 is a similar plan of the machine viewed from
above, and, Figure 14 a plan viewed from underneath. Figure 15 is a diagramatic
plan showing action of the currents from the Steelyard end contacts in switching
the current from another battery to the rotary electro motor.
On Sheet 4, Figure 16 is an elevation of a pawl in position with electro magnet
arranged to lift it out of the teeth when required, also a return spring box and pinion,
and Figure 17 is a transverse section at the same place. Figures 18 and 19 are
side and front elevations of the Carrier pillar to show contacts and other arrangements
in detail. Figures 20 and 21 illustrate other modifications in the methods of
actuating the poise.
On Sheet 5 another modification is shown in which two poises are used and the
method of registering is different. Figure 22 is an elevation part in section
Figure 23 a plan. Fig. 24 an external elevation and Figure 25 an end elevation.
In these drawings the same reference letters and numerals are used to mark the
same or similar parts wherever they are repeated..
In one modification of my electric weighing machine the Steelyard frame C is
balanced upon the knife edge 1 and communicates with the weighing platform through
intermediate levers by the knife edge 2 and the links 3 (Figure 1). To avoid
confusion the knife edge details are omitted from Figures 2 and 7. The free or
vibrating end of the Steelyard C (Figure 3) oscillates when weighing between the
upper
and lower portions of the Carrier J, to the upper part is attached an insulated
connecting Screw 4 and to the lower part a similar connecting Screw 5. from both of
these screws there are metallic projections to make contact when necessary with the
contact springs or fixed plates 6 and 7 above and below the end of C and insulated
The
from each other and the Steelyard by the nonconducing pieces 8 and 9.
extremity of the free end of the Steelyard C (Figures 3 and 4) is 10 and it is
constructed in a special manner, it may be made in one piece rigid with the main
portion of but I prefer it as shown. It is pivotted on the pin 11 and the Springs 12
and 13 keep it in line with the main portion so that when swinging it cannot strike
the points of the upper and lower contact screws 4 and 5 with two great violence, as
might be the case when suddenly rolling off the load, because the springs 12 or 13
yield and allow 10 to move. When 10 is made in ono piece with the Steelyard C
then I sometimes provide contact springs with a longer range than those shown in 6
and 7 to take up any accidental shock as well as to conduct the Current. The electro
magnet 14. the hanging lever 15 with its adjusting Screw weight 16 are required for

page_text: a purpose to De described hereinafter.
In this machine there are three poises D, E, F
of which E can alone be seen on Figures 1 and 5 and D and F in Figure 2.
F alone on figure 6 while the plan Figure 7 shows all three. In figure 9 showing
one extreme of the Steelyard C. E and F can be seen but not D as it does not
extend so far back. All three poises are similarly constructed in the form of racks
which have the ordinary teeth suitable for gearing into pinions on their undersides
and ratchet teeth suitable for pawls on their upper sides. The poises are of graduated
weights and D is in the centre and is the lightest of the three; hereinafter I shall
style it the light poise and E the heavy poises. The light poise is seen in elevation
at Figure 2, D, the ordinary teeth 17, below gear into the pinion 18 which can slide
freely upon the main spindle G driven from the electro motor H by the train of
toothed wheels 19, 20, 21, 22, shown in dotted lines on Figure 1. The pinion 18 can
be moved into position to be driven round by the Spindle G or it may move so that
it is not so driven. When in gear with G it rotates in the direction of the arrows
and the light poise D is caused to travel from the knife edge fulcrum 1 towards the
free end 1 of the Steelyard C. A Wheel 23 is driven by the teeth 17 and coils up a
belical spring 24, the wheel 25 is in turn driven from 23 and is used in connection
with the registering mechanism.
On the upper side of D there are ratchet teeth 26 into which falls a pawl 27
controlled by the armature lover 28 and electro magnet. 29. The light poise rack D
has at its ends wheels 30. 31. which travel over rails 32. 33, and a guiding wheel 34
which keeps it in position so that it runs easily and accurately upon its supporting
rails; a stepped rail 35 is attached to its upper side and is also used for registering.
When a load is placed upon the weighing platform the free end of the Steelyard
(Figure 3) rises and the contact spring 6 touches the end of the connecting screw +
and causes a current to pass from a Battery in such a manner as to set the electro
motor H in rotation in the direction of the arrows; at the same time the electro
magnet I is excited and the armature lever 36 moves the pinion 18 so that its ratchet
teeth 37 (Figure 11) engage with the teeth of the fixed ratchet or clutch 38 fixed
upon the main spindle G. The pinion then rotates and moves forward the light
poise D. If at any portion of its travel its weight is sufficient to balance or over-
balance the load then the Steelyard end 10 (Figure 3) leaves the upper part of the
Carrier J and the contact between the screw 4 and the spring 6 is interrupted; the
current exciting the electro magnet then ceases and the armature lever 36 is pulled off by
the spring 39 moving with it the pinion 18 and causing the teeth 37 to be disengaged
from those of the fixed ratchet 38. The light poise 1) at once stops and although
the spring pinion 23 tends to drive it back to zero again it is prevented from doing so hy
the pawl 27 which falls into the teeth 26 and holds it stationary.
At the same
time the interruption of the current takes away the driving power actuating the
electro motor and it stops. The position of the light poise indicates the weight of
the load. If the load be withdrawn from the platform, the end 10 of the Steelyard C
falls and the contact spring 7 touches the point of the communicating screw 5 and
the circuit is made which causes a current to excite the electro magnet 29 and thereby
attracts the armature lever 28 and lift out the pawl 27 as shown in Figure 2, the
Spring pinion 23 then rotates and drives the light poise D back again to zero when
it strikes the switch lever 55 and breaks the circuit so allowing the spring to pull the
armature lever from the magnet and causing the pawl 27 to fall into the ratchet
teeth 26 again ready for a fresh weighing.
If the light poise is insufficient to balance the load then it moves to its extreme out.
position and the end strikes the contact lever 41 breaks contact with the screw 42
and makes contact with screw 43 which screws are insulated from each other and
from the contact lever 41; the wire connections are so arranged that this movement
interrupts the current exciting the electro magnet I and so permits the withdrawal
of the clutch pinion 18 to stop the light poise D; at the same time the current passes
from the screw 43 to the electro magnet K seen at Figure 11 and it attracts the
armature lever 44 attached to the clutch pinion 45 for actuating the first heavy
poise E. The ratchet teeth of 45 engage the teeth of the fixed clutch 46 and the

page_text: poise E is moved out until by balancing or overbalancing the load it breaks the circuit
by falling from the upper connecting screw or if it does not balance then it brings
the second heavy poise F into action (by striking the contact lever 47. Figure 8,
and breaking contact with the screw 48 and making it with 49). If then the
complete movement of the heavy poise F is insufficient to balance the load, then at
the extreme of its out travel it strikes the contact lever 50 and by breaking contact
with screw 51 and making it with 52 the current from the battery is interrupted and
all the three clutch pinions of the light and heavy poise are withdrawn in succession
from their fixed clutches on the main spindle G while the motor current is also
interrupted and the motor stops. When the load is withdrawn from the platform, the
Steelyard falls and the lower carrier contact is made which directs the current, so that
pawl 27 is lifted by the electro magnet 29 and the light poise moves back; at the
inner extremity of its travel it touches the contact lever 55 and breaks contact with
screw 57 while it makes it with 56, this excites electro magnet 54 of the second heavy
poise F pawl 53 and lifts out the pawl, the poise F then returns propelled by a spring
pinion similar to that described for the light poise and seen on section of 61 (Figure 10)
60 is a similar spring pinion gearing into the first heavy poise E.
The second heavy poise F when returned full back strikes the contact lever 95 and
passes the current by the screw 97 to the electric magnet 58 Figure 7 and lifts the
pawl 59 from the first heavy poise ratchet teeth; it then travels back propelled by the
spring pinión 60 Figure 10 until it reaches zero when the Steelyard rises from
the bottom contact screw 5 (Figure 1) again and is in equilibrium and ready to weigh
again. In order to check undue oscillation of the Steelyard end 10 after balancing,
the light lever 15 is arranged to press against the end of 10 with a presure depending
on the position of the screw bob 16. So long as the current is passing by either of
the connecting screws 4 and 5 it also passes through the electro magnet 14 and it
attracts the armature end of lever 15 and lifts the other end of 10; the Steelyard is
therefore perfectly free from friction in weighing, but when the circuit is interrupted
by the contact springs in 10 being taken away from screws 4 or 5 then the lever 15
falls against 10 and by its slight friction prevents oscillation or striking of either top
or bottom contact springs against the top or bottom connecting screws.
I have now described the general arrangement and action of my electric weighing
machine when only one battery is used and the electro motor and electro magnets
controlling the clutch pinions are arranged to act upon the same electrical circuit in
series.
Under some circumstances I prefer to use two separate batteries one to actuate
the electro motor and the other to control the clutch pinions and the pawls.
On Sheet 3. Figures 12, 13, .4 and 15 are shown the directions taken by the
electric currents in carrying out my invention using two separate batteries.
When a load is placed upon the platform, the Steelyard end. rises and makes contact
with the upper connecting screw 4, one wire from the battery M marked 65 and
shown in cross dotted lines on the pillar J passes first by the electro magnet 14 and
then by branches to both the connecting screws 4 and 5 from which it passes respec-
tively to the upper and lower contact springs on the Steelyard end 10. When contact
is made with Screw 4 as in the drawing. Figure 12, the current passes by a wire 66
from 65 which is the screw of the upper spring contact (as shown on Figure 13) to
the electro magnet N and by exciting it attracts an armature 67 which moves a
switch lever 68 and thereby completes the circuit from a battery ◊ Figure 15 through
the electro motor. This starts the electro motor H.
The details of the wire connection and arrangements of the electro motor switch
lever, are shown on a larger scale at Figure 15 and will be fully described hereinafter.
From the electro magnet N the current passes by the wire 69 and the contact
lever 41, screw 42, the wire 70 to the small poise clutch electro magnet I and thence
by the return wire 71 shown in plain dotted lines to the connecting screw 72 from
which a wire 73 connects to the other pole of the battery M. The small poise clutch
pinion is thereby moved into gear with the fixed clutch upon the main spindle and
the small poise is propelled outwards until the steelyard end falls and breaks circuit

page_text: or until it reaches the outer extreme of its travel. In the latter case it touches the
contact lever 41 and removes it from the screw 42 while it presses it against the
screw 43 this interrupts the current from wire 69 to 70 and electrically connects
the wire 69 by screw 43 with the wire 74 which in turn communicates by contact
lever 47 to screw 48 and wire 75 with the electro magnet K which in turn completes
the circuit by the wire 76 to the screw 72 in permanent electrical connection with
the other pole of the battery M. as I have already described. The first heavy poise E
clutch pinion 45 is thereby brought in gear with the fixed clutch and the first heavy
poise E commences to travel out; if its weight is insufficient to balance the load then
at the extreme of its outward travel it strikes the contact lever 47 and makes
connection between the wires 74 and 77 and through the contact lever 50 to the
wire 78 communicating with the electro magnet L of the second heavy poise clutch
pinion and then completes the circuit by the wire 79 to the return screw 72. The
second heavy poise clutch pinion is thereby moved into gear with its fixed clutch and
the heavy poise F is caused to travel ont; when it attains a position of equilibrium
the steelyard falls from the upper screw 4 and the circuit from the battery M is
interrupted as the end 10 vibrates between the upper and lower screws 4 and 5 without
touching either of them. The electro magnets N and L are thereby demagnetised
and the armature 67 is pulled away by the spring 78 (Figure 15) and moves the
switch lever 68 into the position which interrupts the circuit from the battery O and
thereby stops the electro-motor H. At the same time the spring 79 pulls the
armature lever 80 from the electro magnot L and moves the pinion clutch 81 out of
gear with the fixed clutch 82. The poiso E therefore at once stops and the relative
positions of the three poises at once indicate the weight upon the platform of the
weighing machine.
The interruption of the current holding in the pinion clutches at the end of the
outward travel of each poise, by each poise striking its out switch lever, of course
allows the springs to pull off the pinions but as an additional precaution against their
continuing in gear too long and thereby overrunning and breaking some part I
attach to each poise a wedge or incline piece which at the out end of the travel
forces the pinion clutch out of gear so that the fact of approaching the out end of
the travel takes the clutch out of gear with the main driving spindle independently
of electrical connections. In order that the clutch pinions of the light first and
second heavy poises respectively 18. 45. and 81 shall be instantaneously withdrawn
from their fixed clutches, 38, 46, and 82 when the steelyard balances, I sometimes
use electro magnets to withdraw them from gear as well as to move them into
gear either alone or in addition to springs. The wiring and connections may be
arranged so that I can entirely dispense with the springs 39, 79 and 83 (Figure 11)
but I may use withdrawing magnets with them also as shown at Figures 11, 13, 14
and 15. Figure 11 shows a practical arrangement of the withdrawing magnets and
Figures 14 and 15 are diagramatic to explain connection clearly. When the current
from the battery M passes by the upper connecting screw 4 to the steelyard as I
have first described it excites the electro-magnet N (Figure 15) and the armature is
pulled over against the spring 78; a projection upon it moves the lever 68, upon the
segmental face of which then press two springs 84 and 85. When the magnet N is
not excited the spring 78 pulls the armature 67 and lever 68 into the position shown
in Figure 15 and the ends of springs 84 and 85 press against an insulated piece 86
the battery O communicates from one pole by the wire 87 to the metal plate P which
is in electrical connection with the lever 68; the springs 84 and 85 are mounted
upon insulating pillars which insulate them from the plate P and from each other,
84 connects to one terminal of the electro-motor H and 85 connects to the battery
through wire 88 and the electro magnets I', K¹, L', for withdrawing respectively
the clutch pinions of the light and heavy poises; the wire 89 connects with the other
terminal of the electro-motor and the same pole of the battery O as wire 88. When
the electro magnet N is excited the lever 68 is moved into such a position that the
end of the spring 84 rosts upon the metal and the end of 85 upon another insulating
piece 90. The whole current from the battery O then passes through the electro motor

page_text: magnets to actuate the motor and therefore the motor at once starts but while the
switch lever 68 is moving into that position the end of 85 momentarily touches the
metal of 68 between the two insulating pieces 86 and 90 the whole current from
the battery O is for that instant sent through the magnets I', K, L, which actuate
the pinion clutches to withdraw them from gear this does not withdraw all of
then however when the contact is being made as the current which excites the
electro magnet N also passes through one of the electro magnets I, K, L, for moving
the clutches into gear when required. When the circuit which excites N is
interrupted by the fall of the steelyard however the electro magnets I K L are
neither of theu excited and consequently the momentary current through 1', K¹, L'³,
at once withdraws whichever of the pinion clutches is in gear at the time and ensures
that the others are perfectly clear of the fixed clutches on the main spindle G. If
the steelyard overbalances so that the vibrating end 10 comes in contact with the
lower connecting screw 5 then the current passes by the screw 7 (Figure 13) and
wire 91 to the switch lever 55 by screw 57 to wire 92; it enters electro-magnet 29
and by attracting armature lever 28 it withdraws the pawls 27 from the ratchet
teeth on the upper side of the small poise D. The clutch withdrawing electro
magnets 1, K, L, are in the circuit of the wire 91 by a junction at the point 94
and simultaneously with the drawing of the pawl 27 by its electro magnet the clutch
pinions 18, 45 and 81 are withdrawn from their fixed clutches; this is done to
ensure that the clutch pinions are withdrawn from the fixed clutches on the main
spindle Gif by friction or other cause they held slightly then the rack could
not e propelled back to zero again by the spring pinions. The poise D is then
propelled in towards the fulcrum of the steelyard by the spring pinion 23 (Figure 2)
until the steelyard again balances and breaks contact with the screw 5, the electro
magnet 29 then becomes demagnetised and the armature lever 28 is pulled away by
its spring so that the pawl 27 at once falls into the upper teeth 26 of the poise D and
stops at the position where it is in equilibrium.
When the load is removed from the platform the steelyard remains in contact with the
lower screw 5 during the whole return movement of the poise and it accordingly touches
the contact lever 55, and breaks the communication between the wires 91 and 92
and makes connection between 91 and 93 thence by the switch lever 95 to the
screw 96 and the wire 98, by 98 it passes to the electro magnet 54 controlling the
pawl 53 of the poise F the pawl 53 is thereby lifted out of the ratchet teeth in the
upper side of F and the heavy poise F is driven back by the spring pinion 61.
The circuit is completed from the electro magnet 54 by the wire 99 connecting to
the return connecting screw 72. When the poise strikes the switch lever 95 it
breaks connection with screw 96 and wire 98 and makes it with screw 97 and by
lever 62 to screw 64 thence to wire 100 and to electro magnet 58 from which the
circuit is completed by wire 101 to connecting screw 72. The electro magnet 58 lifts
out the pawl 59 from the ratchet teoth of the heavy poise E and it is then propelled
inwards till it strikes the contact lever 62 and as the screw 63 is not connected to
the battery the circuit is interrupted and all the poises are at zero again and the
steelyard is in equilibrium ready for another weighing.
The arrangement of pawl with its electro magnet armature and the upper ratchet
are the same for the two heavy poises E and F, so also are the spring pinions.
Figures 16 and 17 show the arrangement in elevation and transverse section on a
larger scale and separated from the other parts. The pawl in this case falls into the
teeth by its own weight and forms with the armature 102 a bell crank lever pivotted
at 13, when the armature 102 is attracted to the electro magnet pole pieces 104, the
pawl 53 is lifted out of the teeth; this is a convenient and simple arrangement but it
may be modified in many ways. The spring pinions 60 and 61 shown on section at 61
Figure 2 are of a usual and well known construction. Figures 18 and 19 show on a
larger scale the construction of the contact pillar or carrier J with its connecting screws 4
and 5 the wire 65 and the damper lever 15. The details of the steelyard end 10 are
also clearly shown, the upper and lower contact springs 6 and 7 are connected with the
screws as shown and are insulated from each other and from the end 10.

page_text: The method in which I use a receiprocating motor instead of a rotary one is shown
at Figure 20. The motor electro magnet H attracts an armature R which moves a
lever S pivotted at 105 and causes the driving pawl 106 to force the poise E forward
one tooth which is held by the holding pawl 107. When the armature R is attracted
to Ha lever T also moves and actuates another forked lever U which is a switch
lever with a spring V and a nonconducting piece 108. The current is therefore
interrupted as it reaches the electro magnet H through the lever U; the spring W
then withdraws the armature R and the pawl 106 and the link T at the extremity
of its stroke moves the switch lever U again into electrical circuit which excites the
magnet. The armature therefore oscillates continuously to and fro and actuates
the pawl 106 so long as the current is supplied to H and the poise E travels forward
a tooth at a time until the circuit is interrupted. The arrangements for interrupting
the circuit when the steelyard balances or the poise arrives at the end of its travel
are the same as I have already described in the case of the rotary electro motor and
the spring pinions to return the poise E are also the same. The holding pawl 107
and the driving pawl 106 fall on by the weight of their projecting ends and the
holding pawl is withdrawn when required by the electro-magnet 108 armature 109
and link 110. To allow the poise to return under the action of the spring pinion tho
driving pawl 106 must also be withdrawn for this purpose I arrange a projection 111
from the link 110 so that when the armature lever 109 rises the projection 111
strikes the end 112 of the paw! 106 and so puts it also out of gear. The poise E is
then free to return to the in end of its travel.
In order to ensure that the poise E is always driven forward a complete tooth
whether the circuit to the electro magnet H is interrupted at the middle of a tooth or
not I sometimes arrange the armature R lever S and spring W so that the spring
actuates the pawl 106 during the driving stroke and the attraction of the electro
magnet H is utilized only for the return stroke against the spring.
I can ensure the complete travel of one tooth at a time or as I have termed it berein-
before a step by step action still using the rotary motor. This arrangement is shown
at Figure 21 where H is the rotary motor and 19, 20 and 21 the train of wheels
actuating the main spindle G which is driven in the direction of the arrow it carries
a cam 113 which actuates a lever 114 and a driving pawl 106: the lever being
pivotted at 105 the spring W pulls the lever 114 down, when the cam 113 allows of
it, and makes the driving stroke of the pawl 106, the holding pawl 107 is similarly.
arranged to that in Figure 20. By this arrangement the rotary motor may give a
step by step action which insures one step being made at each stroke as the cam 113
is so shaped that if the end of the lever 114 is slipped it must travel the full
distance.
On sheet 5 Figures 22, 23, 24 and 25 show an arrangement of my electrical
weighing machine with two poises. Both poises are shewn in their zero position
and the steelyard end 10 is swinging freely between the screws 4 and 5 of the contact
pillar J.
The construction of the steelyard frame is in all essential points precisely similar;
the contact levers are arranged with sliding instead of touching contacts. Similar
letters and numerals are used to indicate the same or similar parts.
In this machine a single fixed clutch 115 is used upon the main spindle G
figure 25 having its opposite surfaces serrated and the clutch pinion 18 of the light
poise with its clutch face 37 is thrust in one side and the clutch pinion 45 of the
heavy poise is thrust in on the other side. The electro magnet. I acts on an armature
lever to move the clutch pinion 18 into gear with the fixed clutch 115 and the electro
magnets K, K, act to engage and disengage the clutch pinion 45. The light
poise contact levers are numbered 41 and 35 and the heavy poise contact levers 47
and 62.
Sometimes I combine with a machine having a single poise an arrangement
whereby weights are automatically added to a suspended plate at the vibrating end
of the steelyard. In such a machine I construct the poise so that at its extreme
travel it balances a load just short of what one weight will do and I arrange a number

page_text: of weights one, above another on an endless chain which passes over two pulleys and
is actuated electrically so that when the poise travels full out then the current moves
in a clutch connecting the pulleys with the electro motor and one plate is placed upon
the suspended plate. If this weight balances the load then the steelyard vibrates
between the upper and lower contact and the interruption of the current causes the
pulleys to stop by the lower contact and the poise travels back until it balances as in
the arrangements already described. If the added weight is insufficient to move the
steelyard end from the upper contact, then the pulleys continue moving and the
endless chain deposits weight after weight until it balances or overbalances when
the motion of the chain is arrested as described. The chain is so constructed with
projections carrying the weights and apertures in the flat disc weights that each
weight as deposited clear of the succeeding one which weights are not placed unless
necessary by the steelyard remaining unmoved. When the load is removed from the
platform the weights are picked up by the reversal of the notion of the wheels by
suitable clutch and gear connecting to the electro motor. The arrangement of
Electro motor clutches and circuits and switch levers are similar to that already
described.
To reduce the work upon the electro motor to the lowest possible amount the chain
may balanced by similar series of weights on the other side arranged to be
detached simultaneously or the chain may be partly balanced by a permanent
weight.
Various known methods of registering the weights upon the machine platform
actuated by connection with the poise or poises may be used for my electrical
weighing machines but 1 prefer two arrangements one of which is shewn at Figures 1
and 2 of Sheet 1. and Figures 7, 10 and 11 of Sheet 2. while the second
arrangement is shown on Sheet 5 Figures 22, 23, 24, 25 as applied to the machines
there referred to.
The light poise D Figure 2 engages the teeth of the spring wheel 23 which in
turn drives the wheel 25 this wheel revolves the numbered disc 116 which registers
pounds by bringing a number opposite an aperture in a plate. The quadrant 117
is connected by the spindle 118 to the small lever 119 which carries a small roller or
wheel at its extremity and rests against the stepped rail 35 carried by the poise D.
The position of the poise D upon the steelyard is indicated by the quadrant 117
and the disc 116 and in the case of a machine registering in Tons, Cwts., Qra.,
Pounds the disc 116 is so geared to the poise as to indicate pounds and each step
upon the rails 35 indicates quarters so that when the poise is full out the
quadrant 117 is moved by the lever 119 to indicate three quarters while the disc 116
just indicates short of 28 lbs. The large poises and F are geared to the discs 120
and 121 to indicate Cwts. and the disc 120 first indicates while 121 remains
stationary with an aperture opposite the case aperture to allow the figures on 120 to
be visible. When the poise E has travelled full out then the poise I commences to
move and it revolves the disc 121 also indicating hundred weights. The quadrant 122
indicates tons and it is moved by two levers 123 and 124 on the spindle 125. The
lever 123 Figure 7 first comes in contact with a step upon the rail 126 and after it
has registered as many tons as there are steps the steprail 127 engages the lever 124
upon the same spindle 125 and moves the quadrant 122 further to the limit of its
number of steps. The quadrant 122 thus indicates tons, the disc 121 cwts., the
quadrant 117 quarters and the disc 116 pounds and each indication is visible through
apertures in a suitable case which covers the other figures.
This arrangement may be applied to any system of indications but it is shown in
this machine to weigh as I have stated up to ten tons.
Another arrangement is shown on Sheet 5 Figures 22, 23, 24, 25 in which I use
only two discs but it is suitable for indicating on the metric system and is intended
to register up to 500 kilogrammes. The small disc 128 is geared to the small poise
and indicates up to 25 kilogrammes while the large disc 129 indicates to 500
kilogrammes.

page_text: 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 1
claim is :-
I. In a weighing machine the combination in which a movable poise or movable
poises is or are propelled in one direction along a beam or steelyard by an electro
motor and returned by a spring or springs brought into action by the first movement
together with a pawl or pawls for holding the poise or poises in position against the
spring action substantially as and for the purpose herein set forth.
II. In a weighing machine the combination of a movable poise or poises with
switch levers or contact pieces operated by the poise or poises in such manner us to
interrupt and make electric circuits controlling the connection of the poise or poises
with an electro motor and with electro magnetic pawis substantially as and for the
purposes herein set forth.
.
་
III. In an electrically operated weighing machine using more than one
poise the combination of poises, electro motor, electro-magnetic clutches and electro-
imagnetic pawls with switch levers or contact pieces in such manner that the light
poise travels out the beain or steelyard first when weighing and then causes the
heavy poise to move out by making the necessary electric contacts substantially as
and for the purposes herein set forth.
IV. In an electrically operated weighing machine the arrangement of electro motor,
electro magnetic clutches, and electro-magnetic pawls with switch levers or contact
pieces in such manner that the movement of the poises occurs in sequence, one
after the other so that the movement of a poise is dependent upon the completion
of the movement of the preceding one substantially as and for the purposes herein
set forth.
V. In a weighing machine the combination of electro-motor and electro-magnetic
clutches so arranged that the motor is started and a clutch engaged to propel a poise
when the end of the steelyard touches the upper contact and the clutch is with-
drawn and the poise and electro-motor stopped when the steelyard falls from the
upper contact substantially as and for the purpose herein set forth.
VI. In an electrically operated weighing machine the use of two separate batteries
or sources of electric current, one to supply the electro-motor circuit and the other
to supply the electro-magnets controlling the clutches and pawls substantially as
and for the purpose herein set forth.
VII. In an electrically operated weighing machine the combination of parts
herein before described with reference to Figure 15 of the accompanying drawings
for switching in the motor battery current by the action of the electro-magnet
current substantially as and for the purpose herein set forth.
VIII. In a weighing machine the combination of parts whereby an electric current
is sent through electro magnets, from the lower steelyard contact to withdraw the
clutch or clutches actuating the poise or poises from gear with the fixed clutch or
clutches connecting to the electro motor while the same current also lifts the pawls
substantially as and for the purpose herein set forth.
IX. In an electrically operated weighing machine the combination of parts
whereby an electric current is sent through electro-magnets to withdraw the clutch
or clutches when the steelyard is in equilibrium reference being had to Figure 15
of the accompanying drawings substantially as and for the purpose herein described.
X. In a weighing machine the use of a lever such as 15 Figure 18 pressing
against the end of a steelyard as 10 when it is free to-vibrate between the upper and
lower contact so as to act as a brake and bring the steelyard rapidly to rest
combined with an electro magnet such as 14 to lift the brake lever off the end of the
steelyard while weighing, reference being had to the accompanying drawings.
XI. The combination of parts constituting my improved electric weighing
machine hereinbefore described with reference to Figures 1 to 19 inclusive and
Figures 22 to 25 inclusive of the accompanying drawings.

page_text: XII. The combinations of parts constituting modifications of my improved electric
weighing machine bereinbefore described with reference to Figures 20 and 21 of the
accompanying drawings.
XIII. In an electrically operated weighing machine the combination of poise
and automatically added weights substantially as and for the purpose hereinbefore
described.
XIV. In an electrically operated weighing machine the mechanism for indicating
the weight of the load upon dials, consisting of geared dises and quadrants operated
by stepped rails, substantially as and for the purpose hereinbefore described.
1000
MARKS & CLERK,
13, Temple Street, Birmingham, Agents for Applicant.
MARKS & CLERK,
13, Temple Street, Birmingham, Agents for Applicant.