Mar. 7.] THE NEW ZEALAND GAZETTE. 625

evaporator-chamber of a refrigerating plant, substantially as described. (4.) An apparatus for cooling air, constructed substantially as described with reference to either of the forms or modifications illustrated in the drawings, and operating as specified.
(Specification, 5s.; drawings, 3s.)

No. 13410.—12th February, 1901.—MICHAEL IDVORSKY PUPIN, of 280, North Broadway, Yonkers, New York, United States of America, Adjunct Professor of Mechanics, Columbia University, in the City of New York. Improvements in the art of reducing attenuation of electrical waves, and apparatus therefor.

Claims.—(1.) The method of diminishing the attenuation constant of a uniform wave-conductor which consists in increasing the inductance of the conductor sufficiently to secure the required diminution of the attenuation constant, by distributing along it inductance-sources at periodically recurring points, the distance between consecutive points being such as to preserve approximately its character as a uniform conductor with respect to the waves to be transmitted, substantially as described. (2.) In a system of electrical-wave transmission, a non-uniform wave-conductor consisting of a conductor having reactance-sources distributed at points along its length in such manner that the resulting wave-conductor is equivalent, within proper limits, to its corresponding uniform conductor, but of increased effective inductance, substantially as described. (3.) In a system of electrical-wave transmission, a non-uniform wave-conductor consisting of a uniform conductor, along which reactance-sources are distributed, the total reactance and the distance between the reactance-sources being determined by the wave-lengths to be transmitted, and by the required degree of approximation to a uniform wave-conductor, substantially as described. (4.) In a system of electrical-wave transmission, a non-uniform wave-conductor consisting of a uniform conductor and inductance-coils in series in it at periodically recurring points, the inductance, resistance, and capacity of the interposed inductance-coils being adjusted in such a way as to give, with the inductance, resistance, and capacity of the uniform conductor, a predetermined inductance, resistance, and capacity per unit-length, and the distance between the interposed coils being adjusted in such a way as to equal a fractional part of one-half of the shortest wave-length which is to be transmitted, substantially as described. (5.) In a system of wave-conductors, the combination of a telephonic transmitter and a telephonic receiver, a non-uniform wave-conductor consisting of uniform conductor and inductance-coils in series therein at periodically recurring points, the inductance, resistance, and capacity of the interposed inductance-coils being adjusted in such a way as to give to the resulting conductor a predetermined inductance, resistance, and capacity per unit-length, and the distance between the interposed coils being adjusted in such a way as to be equal to a fractional part of one-half of the wave-length corresponding to the highest frequency essential to the transmission of speech, substantially as described. (6.) A wave-conductor consisting of a uniform conductor and inductance sources interposed in series therein at periodically recurring points, substantially as described. (7.) A wave-conductor consisting of a uniform conductor having inductance-coils interposed therein in series at uniformly recurring points, substantially as described. (8.) In a system of electrical-wave transmission, a non-uniform wave-conductor consisting of a uniform conductor and inductance-coils in series with it at periodically recurring points, the inductance, resistance, and capacity of the interposed inductance-coils being adjusted in such a way as to give with the inductance, resistance, and capacity of the uniform conductor a predetermined inductance, resistance, and capacity per unit-length, which is fixed by the required value of the attenuation-constant, and the distance between the interposed coils being adjusted in such a way as to be equal approximately to one-sixteenth part of the shortest wave-length which is to be transmitted, rendering thus the non-uniform conductor approximately equivalent to its corresponding uniform conductor, the degree of approximation being such that for the highest frequency which is to be employed and for all lower frequencies the wave-length and the attenuation-constant on the non-uniform conductor will differ by less than 1 per cent. from the wave-length and the attenuation-constant on the corresponding uniform conductor.
(Specification, £1 11s.; drawings, 2s.)

No. 13412.—16th February, 1901.—FREDERICK PAGE WOOD, of Auckland, New Zealand, Gunmaker. An improved indestructible tire.

Claim.—The adaptation of a tire, preferably of steel, of a tube-like construction, so that the upper portion may engage or interlock a bead or roll projection in the groove or bead on the wheel or lower portion, and by the action of spring kept in position: the whole or part may be in segments or entire, and the same principle be made applicable to wheels of vehicles of all descriptions, as substantially set forth in drawings and specifications.
(Specification, 2s.; drawings, 1s.)

No. 13414.—14th February, 1901.—WILLIAM ERNEST RICHARDSON, of Outram, Otago, New Zealand, Miller. An automatic brake for steep grades.

Extract from Specification.—The object of the invention is to automatically apply brakes to any vehicle in the event of its speed or rate of travel exceeding a rate or speed previously decided upon. The invention consists of brake-blocks, which can be applied automatically to the wheels of a vehicle, in such a manner that the wheels will be lifted off the track or rails, and the weight of the vehicle thrown on the brake-blocks. The automatic application of the brake is accomplished by means of an ordinary governor, such as is used for the regulation of steam and other engines, and consisting of weights attached to the axle or other revolving shaft in such a manner that the weights are free to fly out from the shaft as the speed increases.

Claim.—The combination and arrangement of parts for the purpose of securing the automatic application of the brake blocks in case of the speed of the car or other vehicle exceeding a fixed maximum, substantially as described.
(Specification, 2s.; drawings, 1s.)

No. 13416.—20th February, 1901.—JOSEPH HALL, of the Burley Engine-works, Leeds, York, England, Engineer. Improvements in machinery for registering, measuring, counting, and weighing material.

Claims.—(1.) An arrangement substantially as shown and described, that will measure and record same on to a tape or any other material, substantially as described. (2.) A machine that will record the number of articles that pass through same, substantially as described. (3.) A machine that will print, emboss, or otherwise mark the material passing through the machine, substantially as described.
(Specification, 4s. 6d.; drawings, 3s.)

No. 13417.—20th February, 1901.—JESSE HERBERT, of Hawkhurst, Opaki, Masterton, New Zealand, Farmer. An attachment to ploughs for removing obstructions from the path of the land-wheel.

Claim.—An attachment to ploughs, consisting of a bar the lower end of which is formed into a deflector-blade, such deflector-blade being secured in position upon the plough a short distance immediately in front of the land-wheel of the plough, as and for the purposes set forth.
(Specification, 1s. 6d.; drawings, 1s.)

No. 13418.—20th February, 1901.—ROBERT OXLADE, of 177, George Street, Redfern, near Sydney, New South Wales, Electrical Engineer, and WILLIAM JOSEPH WHITE RICHARDSON, of 114, Annandale, near Sydney aforesaid, Clerk. Improvements in audible electric telegraphy.

Claims.—(1.) An improved system of electric telegraphy in which signals caused by the breaking of a closed primary local circuit are transmitted to a telephone by an induced current flowing through the line-circuit, substantially as described and explained. (2.) In electric telegraphy, transmitting signals to a telephone by means of an induced current between stations by the arbitrary breaking of the primary current of a transformer, from which such induced current is derived, substantially as described and explained. (3.) In electric telegraphy, interposing a transformer between a sending key for opening a closed circuit at one station and a telephone-receiver at the other, so as to transmit signals between such stations by a secondary or induced current in the line-wire, substantially as described and explained. (4.) In electric telegraphy, having an induced current in the line-wire conveying signals caused by the breaking or opening of a closed local primary circuit, and devices for short-circuiting the secondary coils of a transformer, for inducing said current in the line-wire, substantially as described and explained. (5.) The combination and arrangement with the line-wire of an audible electric-telegraph system, carrying an induced current of battery such as D, a sending-key such as E having connections such as E1 and E3 and contact such as E2, a transformer or induction-coil such as B, a switch such as C having lever such as Cx and contacts such as C1, C2, C3, and C4, and a telephone-receiver such as A with or without a resonator, substantially as described and explained, and as illustrated in the drawing.
(Specification, 8s.; drawings, 1s.)