Jan. 21.] THE NEW ZEALAND GAZETTE. 255

to be wedged or held in its forward position to engage the
flats of the nut, substantially as and for the purposes specified
and as illustrated in the drawings.
(Specification, 3s. 6d.; drawing, 1s.)

No. 17327.—5th December, 1903.—HENRY ALLEN, of
Graham’s Fern, Dargaville, New Zealand, Engineer’s Ap-
prentice. An improved venetian blind.

Claims.—(1.) An improved venetian blind consisting of
the parts arranged, combined, and operating substantially as
specified and illustrated. (2.) A venetian blind constructed
in sections, one suspended from the other, whereby the slats
of one section may be operated independently of the slats of
the other section, substantially as specified and illustrated.
(3.) An improved venetian blind constructed in sections, the
lower section being supported by suspending-bands from
brackets secured to the bottom slat of the upper section of
the blind, the said suspending-bands passing over rollers in
the brackets, substantially as specified and illustrated.
(Specification, 1s. 6d.; drawing, 1s.)

No. 17350.—10th December, 1903.—WILLIAM HUMBLE,
THOMAS STRONG HUMBLE, WILLIAM HENRY HUMBLE, and
GEORGE BLAND HUMBLE, of the Vulcan Foundry, Little
Malop Street, Geelong, Victoria, Ironfounders (assignees of
George William Mitchell McDonald, of Hyams Street, Chil-
well, Geelong aforesaid, Carpenter). An improved floor-
cramp.

Claims.—(1.) An improved floor-cramp having a sliding
rack-bar, a pair of operating pawls mounted in a rocker, and
means of clamping said cramp to the joist, substantially as
set forth and illustrated. (2.) In a floor-cramp, and in com-
bination, a sliding rack-bar in a groove in the top of the bed-
plate, a rocker pivotally mounted on a pair of cheeks, a
handle for said rocker, and a pair of pawls pivoted one above
and one below the spindle of said rocker, substantially as set
forth and illustrated. (3.) In a floor-cramp, an adjustable
eccentric lever pivotally mounted in a lateral slotted lug
having teeth on its upper surface engaging corresponding
teeth on the under-side of a retaining-block held in position
by a wing nut, substantially as set forth and illustrated.
(Specification, 2s. 6d.; drawing, 1s.)

No. 17376.—15th December, 1903.—GEORGE NELSON, of
Clyde Road, Napier, Hawke’s Bay, New Zealand, Mechanical
Engineer. Improvements in refrigerating machinery.

Extract from Specification.—This invention relates to re-
frigerating machinery in which anhydrous ammonia, ether,
carbon-dioxide, sulphur-dioxide, Pictot’s fluid, or similar
medium is employed as a refrigerating agent, the medium
being first compressed, then condensed into liquid, and
finally allowed to evaporate in coils of metal tubes or their
equivalent. Between the condenser or vessel in which the
condensed medium is contained (commonly known as a
“liquid-receiver”) and the coil or coils or vessel in which
the evaporation of the said liquid medium is effected a
valve is employed to regulate the flow of the liquid into the
evaporating-coils. To insure economy and effective working
the passage of the liquid medium to the evaporating-coils
has to be regulated with comparative accuracy, and hitherto
this has been done by operating the valve referred to by
hand, which has necessitated constant attention. The object
of my invention is to automatically regulate the flow of the
liquid medium into the evaporating-coils or other form of
evaporator, and for this purpose I employ a vessel into which
the liquid medium passes on its way to the evaporating-coils
and a float within said vessel which actuates a valve whereby
the height of the liquid in said vessel is automatically regu-
lated. The float can be adjusted to maintain the level of
liquid in the vessel at any desired height. By thus varying
the liquid-level the supply of liquid to the coils can be ad-
justed with much greater delicacy than is attainable by
present methods. Means are employed to strain the re-
frigerating-liquid before it passes through the valve which
admits it to the vessel, an oil-trap is used for removing any
oil which may separate out from the liquid, and an indicator
is used to show the position of the float within the vessel.
These being the objects of my invention and the manner in
which I carry out the same, the mechanical details of con-
struction may be readily modified by an engineer skilled in
the art to adapt them to requirements of any particular
refrigerating system.

[NOTE.—The above extract from the specification is inserted
in place of the claims.]
(Specification, 7s. 6d.; drawings, 2s.)

No. 17399.—18th December, 1903.—NATHANIEL LOMBARD,
of 81, Thomas Street, Worcester, Massachusetts, United
States of America, Mechanical Engineer. An improved
governor for controlling the speed of motors or like powers.

[NOTE.—The following description of the operation of this inven-
tion is inserted in place of the claims.]

With the parts in the relation here illustrated power is
applied to the pulley 28 to drive the centrifugal mechanism
left-handedly at such a rate that, normally, for the desired
speed of rotation of the motor the weights are substantially
at the centre of their range of movement and the various
screws, racks, and the roll 60 will also be at the centre of
their path. This condition continues until there is a change
in the speed of the motor, as, for example, an increase.
This results in the primary support 72 rotating more rapidly,
causing the weights to move outwardly upon the secondary
support under the increased centrifugal force generated, and
their racks, moving by the sleeve 37, rotate it so that it
moves down the screw 39. This lowers the valve 57, admit-
ting pressure to the right-hand end of the cylinder (see Figs. 1
and 6, where the movements of the various elements are
indicated by arrows). The travel of the rack 48 as a result
thereof moves the coasting end of the lever 42 to the left or
inwardly about its lower end as a fulcrum, the shaft 55 being
for the time stationary and the segment rocking on the
worm. This movement of the lever carries the operating-
rod 39 to the left, sets the clutch 20, and compels the actuat-
ing-shaft to rotate with the driving-shaft 22 right-handedly,
turning the shaft 12 in such a direction as to close the gate
if, for example, a hydraulic system is being governed. But
before the above-mentioned movement of the weights occurs,
the secondary support, lagging behind the primary support
upon the increase of speed because of its inertia, produces a
very quick movement of rotation between the weights and
screw 96, the secondary support turning against the tension
of the springs 92. This results in a movement of the con-
trolling-rod in the same direction as that secured by an out-
ward travel of the weights, but more promptly, thus effecting
an immediate partial correction by 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 overcorrect.
To obviate this difficulty and check the piston, the pulley 114
is rotated by its spring so that the shaft 111 is moved
by the pinion and rack to the left. This rotates
the sleeve 108 and causes it to ascend the thread 109 so that
the valve-rod as a whole is shortened, this continuing until
the valve is restored to its initial position at which the
pressure is shut off both ends of the cylinder. To counteract
the effect of the power-cylinder upon the clutch to permit
the return of the valve to its normal position and the conse-
quent checking of the piston to stop the movement of the
gate, a compound movement of translation is automatically
imparted to the lever 42 in the following manner: As soon
as the actuating-shaft begins its rotation through the con-
nection made by the clutch 20 it also rotates the shaft 55
right-handedly through the gearing 56. This causes the
worm to move the lower portion of the lever to the right
upon the rack-teeth as a fulcrum, and this being in the
opposite direction to the travel of the rack tends to release
the clutch. As long as the piston continues its movement
the rate of travel of the upper end of the lever will exceed that
of the lower end 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 lever
disengages the clutch and the movement of the gate at once
ceases until the valve again acts. As the above operations
will restore the motor system to its normal speed the weights
will return to the position they occupied before the change
occurred, and unless their effect upon the valve-rod is
neutralised they would move it in the opposite direction and
destroy the balance of forces just attained. The mechanism
actuated by the roll 119 prevents this. While the weights
occupy their normal position the roll will be at the centre of
the disc 120 and will remain at rest, but as soon as the shaft
moves longitudinally in acting to shorten the valve-rod it
carries the roll off the centre to a point having rotary travel.
This rotates the roll and the shaft, and the thread of the
latter turning in the sleeve 116 moves the shaft to the right
until the roll again reaches the axis of the disc, causing the
sleeve 108 to be lowered upon the screw 109 and moving the
valve downward an amount equal to that which it is moved
upward by the return of the weights. It will be evident that
the farther the weights depart from the normal the farther
the roll will be carried from the centre of the disc and the
more rapidly the shaft be rotated, and therefore the neutral-
ising of the return of the weights will be at a rate varying
with the extent of their movement and the distance which
the shaft has been moved, being at first most rapid, then
gradually decreasing as the roll returns to the centre. The
neutralising effect will, moreover, be substantially propor-
tional to the rate of return of the weights to the normal.
(Specification, £1 3s.; drawings, 7s.)