Oct. 5.] THE NEW ZEALAND GAZETTE. 2385

rod 32 in the nut 36 and the clutch will remain in engagement, but as soon as the piston is checked by the return of the valve to its normal position this outward movement of the rod disengages the clutch and the movement of the gate at once ceases until the valve again acts. This rotation of the actuating-shaft 13 will impart movement through the gears 15, 16 to the motor-controlling shaft and cause a closing movement of the gate, if, for example, a hydraulic system is being governed, or a similar operation upon such motor as may be connected with the shaft 13 and the speed of which it is desired to regulate. The rotation of the operating-member 32 will cause a revolution of the member 95. As the weights move outwardly to effect a movement of the clutch-members through the medium of mechanisms already described the controlling-rod 98 is moved in a direction that will operate the connector 68 to increase the distance between the nut 76 and the lever 61 so that the lever 61 will operate more promptly than it would act otherwise, thus operating the valve 50 immediately to effect a partial correction of the governor which is continued more gradually by the mechanism previously described until the desired movement is attained. If the weights acted alone upon the controlling-mechanism they would tend to cause too great a movement or to over-correct. To obviate this difficulty, and partially check the movement of the connectors 68, the gear 71 on the latter is operated by the rack 104 and moved quickly at the beginning of its movement, but this movement is gradually decreased as the roller 99 moves diametrically across the disk 100 and away from its centre. The action of the revolvable sleeve 95 on the controlling-rod 98 is constant while the rotation of the roller 99 is increased with its distance from the centre of the disk 100. This gradually decreasing effect of the rack 104 upon the gear 71 is due to the increase of speed of the roller 99 as it moves away from the centre of the disk 100, which permits the threaded end of the controlling-rod 98 to more rapidly screw into the sleeve 95, and thereby more effectively offset the movement of said rod in the opposite direction effected by the action of said revolvable sleeve upon said threaded end. In other words, during the revolution of the member 95 the action of the threads on its bore is to effect a constant movement of the rod 98 toward the connector 68. At the beginning of this movement the rotation of the roller 99 causes only a very slight turning of said threaded end of the rod 98 in the same direction, but as the roller moves further from the centre of the disk 100 and gradually increases in speed the threaded end will turn faster in a direction to practically offset the operation of the revolvable sleeve 95 thereon in the opposite direction. It is evident, therefore, that the initial action of the weights will cause the controlling-mechanism to effect a quicker movement of the clutches and regulating-mechanism than could be secured if the weights acted alone, and this action on the part of the controlling-mechanisms gradually decreases so that there is no opportunity for the various devices to over-correct. When the speed decreases and the weights return to their normal operative position the clutch-members are released and the revolution of the operating-member 32 and member 95 stops. The disk 100 continues to revolve, however, and act upon the roller 99 rotating it and causing the rod 98 to be screwed into the sleeve 95, and this movement of said rod will turn the connector 68 in its nut 76 to decrease the distance between said nut and the lever 61, thereby returning said lever to its normal position, when all of the mechanisms forming a part of the governor will be ready to care for any further increase or decrease in the speed of the motor. It is obvious that in the operation of the various controlling-mechanisms as described the roller 99 will remain at rest at the centre of the disk 100 while the centrifugal weights occupy their normal position, but as soon as the controlling-rod carries the roller off the centre to a point having rotary travel the roller and rod upon which it is mounted will be operated thereby in the sleeve 95 until it again reaches the axis of the revolvable disk 100. It will be evident that the farther the weights depart from the normal the farther the roller 99 will be carried from the centre of the disk and the more rapidly the shaft upon which said roller is mounted will be rotated, and therefore the neutralising of the return of the weights will be at a rate varying with the extent of their movement and the distance which the rod has been moved, being at first rapid, then gradually decreasing as the roller returns to the centre. The neutralising effect will, moreover, be substantially proportional to the rate of return of the weights to the normal. Should any sudden load be put upon the governor which would tend to injure the various mechanisms the increase or decrease would be cared for by the tension-devices 70, which permits of the movement of the connector 68 independent of the lever 61 under abnormal conditions as is obvious. The dash-pot mechanism secured to the valve 50 prevents too sudden action of this valve, and thereby prevents injury to the various mechanisms. The action of this improved governor will be to secure a more rapid or greater correction

for changes of speed of the motor governed, arising from change of load or the like, without permitting this correction to overrun and produce a see-sawing of the speed in opposite directions. This governor mechanism, moreover, secures an almost absolutely constant rotation of the motor system driven thereby, while applying at all times ample power to overcome any resistance to movement of the gate or other regulating system. It is believed that, with the foregoing description, the operation of this governor will be fully understood without further description.

[NOTE.—The above extract from the specification is inserted in place of the claims.]

(Specification, £1 7s.; drawings, 8s.)

No. 19804.—29th July, 1905.—JAMES JOSEPH BLOCKLEY, of College Street, and JOHN ALFRED LISSINGTON, of Scandai Street, both of Palmerston North, New Zealand, Plumbers. Improvements in ventilator-cowls and chimney-pots.

Claims.—(1.) The improved double-draught ventilator-cowl and chimney-pots, as and for the purpose described, and illustrated in the drawings. (2.) An improved double-draught ventilator-cowl and chimney-pot formed with half-cones and guards, substantially as and for the purposes described, and illustrated in the drawings.

(Specification, 1s. 6d.; drawings, 2s.)

No. 19898.—16th August, 1905.—FRANCIS WILLIAM PAYNE, of Dunedin, New Zealand, Mechanical Engineer. Improved differential screw device for removing and replacing bushes and the like.

Claims.—(1.) In screws for obtaining power, in combination, a differential screw composed of the usual coarser and finer pitch threads so that by winding or drawing on the coarser screw the finer one unwinds or gives, but not as much, with a nut to each, means for moving either the double-screw or one or both of the nuts and stopping any movement not wanted, all substantially as shown and as explained, and as shown on the drawing, for the purposes set forth. (3.) In combination, a differential screw so arranged that the differential action can be superseded by direct action as needed, with means of working or stopping the movement of the different parts as needed, substantially as set forth, and for the purposes set forth. (3.) In differential screws, the arrangement, as set forth, of the combined screw, the nuts for spanners or for ratchet levers, the hollow distance-piece, and means of stopping any action and proceeding with a quicker or slower action, substantially as set forth, and for the purposes indicated.

(Specification, 4s. 6d.; drawing, 1s.)

No. 19902.—18th August, 1905.—WILLIAM ADAMS, of Dunedin, New Zealand, Miner. Improved fine-gold extractor.

Claims.—(1.) In machines for amalgamating fine gold and mercury by moving surfaces of amalgamated metal coming into contact with the particles of the gold, in combination, a revolving cylinder with amalgamated outer surface rotating against the stream of wash and gold, and working in fluid mercury, with a thin stream of clean water under pressure thoroughly cleaning and brightening the surface of said cylinder where it contacts with the gold in said wash, said water keeping back the wash from getting between the cylinder and the casing, all substantially as shown on the drawing, and as described and as explained. (2.) In combination in an amalgamating plant, a revolving cylinder working in a watertight casing, with means of taking said cylinder out when needed, with a forced thin sheet of clean water directed so as to keep the surface of said cylinder in a proper state for contact with gold particles, all substantially as set forth, and as illustrated in the drawing.

(Specification, 4s.; drawing, 1s.)

No. 19903.—18th August, 1905.—WILLIAM ERNEST SARGOOD, of Dunedin, New Zealand, Merchant. Improved seamless back and seamless side boots.

Claims.—(1.) In the class of boots hitherto having straight or unshaped backs, in combination, a solid back piece connected to the front piece that goes right round from quarter to quarter joining the said solid back piece by two seams, one on each side or the back, all substantially as shown on the drawing, and as described and explained. (2.) In that class of strong boots that had straight backs and side seams, the combination of solid backs or seamless backs with seamless sides, the seams being on the quarters only, all substantially as set forth, and as shown on the drawing.

(Specification, 2s.; drawing, 1s.)