2408
THE NEW ZEALAND GAZETTE.
[No. 87

unite with the gas, which is fixed and saved. The process can be carried on by first directing the air or steam through the apparatus in one direction and then reversing the direction of the flow as desired, in the manner fully set forth hereinafter.

In the manufacture of coke two general principles are employed. The one most generally in use is known as the bee-hive oven, so called from its shape. In the centre of the arch of these ovens is a charging-hole through which coal is introduced and levelled over the bottom of the oven to a depth of from 1 ft. to 3 ft., the oven being preheated. On one side of the oven is an opening bricked up to within a few inches of the top, and through the opening thus left air is drawn into the oven for admixture with the gases evolved from the charge of coal. This mixture, being ignited, maintains the heat of the oven, thereby continuing the evolution of gas from the coal until the same is thoroughly coked. During the early stages of the coking period large volumes of combustible gas escape from the charging-hole of the oven, and, igniting, burn in the open air, and the resulting heat from this secondary combustion is entirely wasted. After the gases have been extracted and the solid portions of the coal have been entirely converted into coke, water is introduced directly on to the coke in sufficient quantities to cool it and to enable labourers to draw the same out through the opening in the side, which is made larger by removing the loose brick at that portion of the oven. This wasteful and slow method of producing coke is now more generally used than any other system, simply because of the superior quality of coke made by reverberatory heat in internally fired ovens. Many attempts have been made, but with slight success, to produce coke in a shorter time, where the coke, in an incandescent state, is discharged and cooled outside of the oven, principally for the purpose of retaining the heat, which is entirely lost in the aforementioned system. Other forms of ovens are employed to a limited extent, and the builders of the same have made efforts to overcome the difficulties of heating their ovens by utilising a portion of the gases produced for that purpose; but, as they are heated externally, the same as the ordinary gas-house retort, nearly all of the gas produced is required to keep up the necessary heat, and then the coke is inferior to that produced in the internally heated ovens. Among the numerous difficulties in the way of an economical production of coke under these systems is the one of keeping up the heat inside of these large retorts, owing to the necessarily very thick firebrick walls, which allow very little gas to be saved above that necessary to keep up the heat; and, again, the peculiar construction of these ovens makes them subject to frequent expensive repairs. The difference between my process and the process above described is that, instead of heating the ovens externally for producing coke, I perform the heating internally, and depend upon the reverberatory heat of the arches to do the coking, precisely as in the bee-hive type of oven, with the additional improvement over the bee-hive oven of so arranging the apparatus that the air for combustion of the gas arising from the coke is admitted at a very high degree of heat, and all of the gases not burned under the arches of the ovens during the heating process are completely consumed in heating the regenerators, superheaters, and especially constructed steam-generators. The heating process being intermittent, the greater portion of the time consumed in coking is utilised in taking off and saving the surplus gases arising from the coking coals. So far there have been no coke-ovens in use where the heating of the ovens has been intermittent and the gases evolved from the coal by the heat reflected from the internally heated arches have been saved.

[NOTE.—The number and length of the claims in this case preclude them from being printed, and the foregoing extract from the specification is inserted instead.]

(Specification, £1 16s.; drawings, 3s.)

No. 15515.—16th October, 1902.—JOHN PETER WIENS, of 122, Sycamore Street, Milwaukee, Wisconsin, United States of America, Manufacturer. Improvements in the construction of dustless sweeping-brushes.

Claims.—(1.) A dustless sweeping-brush comprising a brush-back provided with non-absorbent and absorbent tufts, the latter communicating with openings through said back, and a metallic cap fitting over said back forming a reservoir for the moistening liquid, and provided with a closable port for the admission of said liquid to said reservoir. (2.) In connection with the subject-matter of claim 1, a handle-clamp secured to said brush-back, and formed with a transverse upper slot, a nut movable beneath the slotted top of the said clamp, and a handle having a screw rigidly secured to its lower end for engagement with said nut, and adapted for transverse travel within said slot.

(Specification, 2s. 9d.; drawings, 1s.)

No. 15516.—16th October, 1902.—WILLIAM ALEXANDER MADDERN, of Boulder City, Western Australia, Engineer. An improved ore-roasting furnace.

Claims.—(1.) In an ore-roasting furnace, a semi-rotating rabble-arm which by being raised for a portion of the back stroke passes over the top of the ore in the form of an arc of a circle and returns horizontally, conveying more ore upon the forward than upon the backward stroke, substantially as described, and illustrated in the drawings. (2.) In an ore-roasting furnace, an air-cooled rabble whereby cold air is drawn through the rabble, cooling the same and supplying hot air for oxidizing in the furnace, substantially as described, and illustrated in the drawings. (3.) In an ore-roasting furnace, a toggle joint by means of which the rabble is raised above the ore in the furnace in its return stroke and allowed to move horizontally in its forward stroke, and consisting of a toggle, a bottom socket, and a top socket and hinge, substantially as described, and illustrated in the drawings. (4.) In an ore-roasting furnace, the combination of a regenerative and cooling hearth for the simultaneous cooling of the roasted ore and the supply of hot air for the combustion of the fuel, substantially as described, and illustrated in the drawings. (5.) In an ore-roasting furnace, combining a semi-rotating rabble-arm, an air-cooled rabble, a toggle joint for raising the rabble on the back stroke, a regenerative and cooling hearth, and assemblage and combination of the various parts, substantially as described, and illustrated in the drawings.

(Specification, 5s. 6d.; drawings, 2s.)

No. 15522.—16th October, 1902.—THE TOLEDO GLASS COMPANY, a corporation organized under the laws of the State of Ohio, having their principal place of business at 734, Spitzer Building, Toledo, Ohio, United States of America, Glass-manufacturers (assignees of Michael Joseph Owens, of 2263, Lawrence Street, Toledo aforesaid, Glass-worker). Improvement in machine for and method of gathering and shaping glass.

Claims.—(1.) The process of producing glass articles which consists in sucking the molten glass into a mould or cup, cutting off the glass in the cup from that in the tank, bringing the gathered glass into operative relation to a shaping-mould, and then shaping the gathered glass to its final form in said shaping-mould. (2.) The process of producing glass articles which consists in forming a blowing-blank by sucking up the molten glass from a pool into a blank-forming mould, enclosing the blank thus formed in a blowing-mould of the shape of the article to be formed, and then expanding the blank in the blowing-mould. (3.) A movable suction-mould and a cut-off for severing the glass in the mould from that in the tank or pool. (4.) A movable mould, means for dipping the mould into the molten glass, for exhausting the air therefrom, and a core or plunger for forming a blowing-cavity in the upper end of the blank. (5.) A movable suction-mould for forming a blank, having a withdrawable core for forming a blowing-cavity, a cut-off for the lower end of the suction-mould, and means for expanding the blank after it is gathered into the suction-mould. (6.) A movable suction-mould for forming a blank of a length substantially equal to the length of the article to be blown, and a core for forming a blow-opening in the upper end of the blank. (7.) In a glass-forming machine, a movable support, a suction-mould thereon adapted to be lowered into the molten glass and be raised therefrom, a cut-off for the lower end of the suction-mould, and a shaping-mould to which the suction-mould may be moved and in which the blank is blown. (8.) In a glass-forming machine, a suction-head, a blank-forming mould supported below the same, comprising a partible blank mould and a cut-off. (9.) In a glass-forming machine, a suction-head, a suction-mould depending therefrom, and a movable core projecting into the upper end of the suction-mould to form an initial blow-opening. (10.) In a glass-forming machine, the suction-mould having an upper and lower section, devices for clamping these sections together during the sucking-period, a cut-off operated across the lower end of the suction-mould, and a core for forming an initial blow-opening at the upper end of the suction-mould. (11.) In a glass-forming machine, a suction-mould for sucking a blank directly from the molten mass, means for suspending the gathered blank when formed therein, and for blowing the blank to the initial form while thus suspended. (12.) In a glass-forming machine, a partible suction-mould depending from a suction-head, and suction-channels such as 20 in the meeting edges of such moulds connected with the suction-head to prevent leakage of air into the suction-mould during the filling thereof. (13.) In a glass-forming machine having a suction-mould adapted to be dipped into the glass, of a cut-off for the lower edge thereof comprising the apertured plate 17 and means for