Mar. 9.] THE NEW ZEALAND GAZETTE. 959

variation in the amount of air conducted through the charge
during the progress of and after the completion of the
clinkering reaction.”

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After word “process” insert “in its first form.”

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“process,” delete words down to “exit,” line 6, and insert
“in its present form.”

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form of the.”

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“treatment.”

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of the page.

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on page 14, and insert the following:—

“The process in its third form also may be used for clinker-
ing finely divided oxide ores, concentrates, or flue-dust. The
finely divided ore to be clinkered is intimately mixed with
powdered coal, coke, charcoal, or other combustible material,
and is charged into one of the types of furnace referred to.
The upper surface of the charge is agglomerated by contact
with hot-furnace gases, generated by the combustion of
extraneous fuel; air is introduced at the lower surface of the
charge, and is conducted upward through the interior of the
mass of ore; the heat, applied to the upper surface, is propa-
gated downward through the mass to the lower surface by
internal combustion, and the upper portion of the charge is
thereby clinkered; another clinkering reaction is propagated
upward from the lower surface by the continued blowing of
air through the mass, thereby clinkering the lower portion of
the charge; and the volatile products of combustion escape
at the upper surface and join the furnace-gases. The furnace-
gases must be sufficiently reducing to partly deoxidize the
material at the upper surface of the charge so as to initiate
the agglomerating reaction which is propagated downward
through the upper portion of the mass. The formation
of a fused layer at the upper surface of the mass
has the incidental advantage of preventing the waste
gases from carrying away the finely subdivided particles of
the charge. When this form of the process is carried on in
a reverberatory furnace, with a fixed perforated hearth, the
clinkering of the upper portion of the charge proceeds while
the plane of combustion is being propagated downward, but
the clinkering of the lower portion of the charge does not
begin until the plane of combustion reaches the lower sur-
face. When the material is treated in a chain grate stoker
furnace the various stages of the treatment take place
simultaneously; the clinkering of the upper portion of the
charge proceeds downward, and the plane of combustion is
propagated downward through the mass, in one part of the
furnace, while the previously heated lower portion of the
charge is being clinkered in another part of the furnace.
When the process in any of its forms is used for clinkering
iron-oxides, an important feature in the economy of the treat-
ment is in maintaining in the interior of the charge the
least degree of reduction that will permit the propagation of
the agglomerating reaction, and this condition necessitates
the use of the minimum amount of combustible material in
the charge. The carbonaceous components in the charge
may be still further reduced in quantity by adding com-
bustible gas to the air, conducted through the mass, or by
substituting hot air for cold air. When it is desired to pro-
duce clinker containing the lower oxides or more or less
reduced metal it will be necessary to maintain, in the interior
of the charge, conditions that are more highly reducing than
those required for the production of high oxide clinker.
Such highly reducing conditions may be secured by the use
of larger proportions of carbonaceous material in the charge,
or by the addition of combustible gas to the air used for the
propagation of both reactions, or by the use of air for the
propagation of the initial reaction and combustible gas for
the propagation of the second reaction. The finished pro-
duct may be made into large and relatively dense blocks of
clinker, such as are desirable for open hearth furnace use, or
into highly porous and relatively small pieces of clinker,
such as are desirable for blast furnace use, by varying the
amount of air blown through the charge during the progress
of and after the completion of the clinkering reaction.

“The process in its second form requires for its proper
conduct that the conditions relating to the composition of
the charge, the composition and temperature of the igniting
or heating gases, and the composition, temperature, and
pressure of the combustion-supporting gas, be properly corre-
lated, so that a heating zone unaccompanied by a clinkering
reaction will be propagated downward through the charge to
the lower surface during the first stage of the process, and
so that during the second stage the additional air conducted
through the charge and acting upon the heated material
will initiate a clinkering reaction at the lower surface, and
will aid in propagating this clinkering reaction upward
through the charge to the upper surface. During the first
stage of this form of the process, the charge must be main-
tained in a loose, granular condition, so that the material of
the charge can be properly calcined, roasted, or otherwise
treated before it is clinkered.

“The process in its third form requires for its proper
conduct that the conditions relating to the composition of
the charge, the composition and temperature of the igniting
or heating gases, and the composition, temperature, and
pressure of the combustion-supporting gas, be properly
correlated, so that during the first stage a clinkering re-
action will be initiated at the upper surface and will be
propagated downward through the upper portion of the
charge coincidentally with the heating of the charge which
progresses from the upper to the lower surface, and so that
during the second stage the additional air conducted through
the charge and acting upon the heated material will also
initiate a clinkering reaction at the lower surface, and will
aid in propagating this clinkering reaction upward through
the unclinkered portion of the charge. In this form of the
process increased speed of operation is attained by clinkering
a portion of the charge during the first stage and another
portion of the charge during the second stage.”

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these pages down to line 25, page 22.

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the,” and delete words “and claimed.”

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insert “one or more,” and add letter “s” to “reaction.”

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mass.”

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letter “a.” After word “mass” insert “in the various
ways described.”

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cable” down to “described.”

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“roasting.” and after word “roasting” delete “calcining
or.” After word “reducing” delete word “and.”

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word “agglomerating.”

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action,” and insert “and.”

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insert “one or more stages.”

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“also” after “be.”

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and insert “one or more.” Add letter “s” to “reaction.”

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after the word “in,” insert “the various ways described.”

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other than” to the end.

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“Neither do I.”

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My reasons for making this amendment are as follow:
To more clearly explain and define the subject-matter of the
invention.

J. C. LEWIS,
Registrar.

Applications for Letters Patent abandoned.

LIST of applications, with which provisional specifica-
tions only have been filed, abandoned (i.e., complete
specifications not lodged) from the 18th February to the
2nd March, 1911, inclusive:—

No. 27585.—E. J. Chilton, flushing-cistern valve.
No. 27592.—C. W. Ford, bicycle-pedal toe-strap.
No. 27593.—J. W. Mann and H. O. Brown, motor.
No. 27599.—E. N. Waters, boot-machine tool-shield.
(United Shoe Machinery Company—A. D. Elliott.)
No. 27600.—J. O. Jones, milking-machine.
No. 27603.—J. Duff and C. O’Connell, ladder.
No. 27606.—J. W. Tattersfield and H. C. Abbott, folding
bedding.
No. 27608.—W. Duggan, jun., tool.
No. 27612.—W. V. Page, attaching label to fabric.
No. 27617.—V. R. Johns, tennis-ball preserving.
No. 27618.—J. C. Fraser, boat-disengaging gear.
No. 27620.—H. August, motor-car-wheel tube.
No. 27622.—W. McKay, broom.
No. 27623.—G. Me calfe, tire, &c., wearing material.
No. 27624.—M. Blair, reinforced concrete.
No. 27628.—H. P. Rasmussen, insulating-composition.

B