the 4-!b weight is being lifted. But at the same instant that the cutoff takes place the rider weight is lifted olT the end of the balance by a

From the Notice Issued by the Standards Department o(the Board of Trade, by permis:jiaa of Ihe Controller of H.M . Stationery Office. Fig. i6. — Automatic Tea Weighing Machine. self-acting arrangement, and the sugar in Iransilu takes its place in the bag. And, if the rider weight has been correctly adjusted, the bag of sugar will be

shown to w-eigh exactly

4 lb by the beam vibrating

in equipoise.

AIItornatic Coal

Weighing Machine (fig.

I8).

— This machine

weighs the coal delivered

into factories,

&c., by charges up to

20 cwt. at a time, and

records and sums up

the weights of the

charges so as to exhibit

the total weight

delivered. The whole

of this work is effected

automatically.

The coal is dropped

into a hopper by a

grab. The hopper is

carried on two knife edges,

one on each side,

and is prevented from

tipping over fore and

att by a pair of parallel

motion bars on each

side. The knife-edges

on which the hopper

rests are on two horizontal

levers, one on

each side of the hop-From

the Notice issued by the Standards Department ^^-J^u^'^ ^YJ-^

7^

of the lio.rd of Trade, by permission of ihc Controller carried by knile-cdgc

of H.M . Stationery OlTicc.

fulcra in bearings on

FiC. 17. — Automatic Sugar Weighing

• he frame of the maMachine,

chine, and transmit the

weight of the hopper

by means of an intermediate lever and a vertical rod to the indicator lever.

And the long arm of the indicator lever pulls AUTOMATIC

vertically upon the spring of an ordinan/ spring balance, which registers the load, and with the addition of suitable counting mechanism sums up the weights of any number of successive loads 1 he charges of coal fall into the hopper with a heavy shock, and in order to save the knife-edges there is a strong pin in each sif'o of the hopper below the knife-edge, which, before the charge of coal is dropped into the hopper, is acted on by a strong horizontal flitchplate, which heaves the hopper off the knife-edges and relieves them from the shock. The heaving-up of the flitch-plate and hopper is effected by a cam on the end of a horizontal shaft which runs along the back of the machine behind the hopper. The flitch-plate rests at one end on the top of this cam, and at the other end is shackled to the horizontal arm of a bell-crank lever which is r^ivoted on the frame. v hen a charge of coal is dropped into the hopper, the bell-crank lever receives a violent jerk from the shackle of the flitch-plate, and this jerk by means of suitable mechanical arrangements throws a pmion on the cam shaft into gear with a wheel on a counter shaft, From the Notice issued by the Standards Department of the Eoaid of Trade, by permis.'iion of the Controller of H.M. Stationery Office. Fig. 18. — Automatic Coal Weighing Machine. which is kept constantly running by means of a belt and pulley driven by an engine. The cam shaft and the cam then begin to revolve, and the flitch-plate is gradually lowered till the knife-edge bearings of the hopper are received on the knife-edges of the main measuring levers, and the load is then weighed by the levers and the spring-balance.

Shortly after this is done the mechanism at the back of the hopper automatically opens the doors at the bottom of the hopper, and the roal drops out. The rotation of the cam shaft continues till the cam has again heaved up the flitch-plate, when the pinion on the cam shaft is thrown out of gear with the wheel on the counter shaft, and the cam remains steady till another charge of coal is dropped into the hopper and the action is renewed. The coal when dropped out of the hopper runs dov/n a shoot into a receptacle, from whence it is lifted by a Jacob's Ladder and distributed to the boilers, &-C ., of the factory.

Automatic Coal Weighing Machine (fig. 19). — This machine is designed to wci^h and total up the weight of materials passed over it during a considerable course of operations. The trucks or other receptacles containing the coal, &c., are drawn upon the platform of thi- machine, and the pull of the load is transferred by a vertical rod at the left-hand end of the machine to the knife-edge on the shoit arm of the steelyard, who;ie fulcrum is carried on bearings in the frame. Behind the pulley at the top of the machine and on the same shaft is a spur wheel, which drives both of the spur wheels shown in the diagram. The small spur wheel is mounted on the steelyard, and

this wheel and the one that drives it arc so arranged that their line of