1656
THE NEW ZEALAND GAZETTE.
[No. 77

lamp heaters which consists in electro-magnetically rupturing the heater circuit, and preventing the restoration of the circuit by positive means. (5.) The process of operating automatic cut-outs for the heaters of Nernst lamps having multiple glowers which consists in utilising the windings of the electro-magnetic cut-outs as a portion or all of the steadying resistance for the glowers. (6.) The process of operating automatic cut-outs for Nernst lamp heaters which consists in utilising for the operation of the cut-out, either in whole or in part, the current passing through less than all of the glowers of a multiple-glower lamp. (7.) The process of operating automatic cut-outs for Nernst lamp heaters which consists in arranging the cut-out magnet in circuit with two or more ballast or steadying resistances arranged in multiple. (8.) The process of operating automatic cut-outs for Nernst lamp heaters which consists in causing the heater to approach the glower by electro-magnetic means and afterwards to recede therefrom. (9.) The process of operating automatic cut-outs for Nernst lamp heaters which consists in providing an additional safety cut-out in the heater circuit itself, designed to act eventually should the glower circuit be inoperative. (10.) In an electric lamp having a glower composed of material which is a non-conductor when cold and a conductor when heated, of a heater, a retracting-device for the said heater, a device in the heater circuit adapted to overcome said retracting-device, and a circuit-breaker for the heater circuit. (11.) An electric lamp of the Nernst class having its glower and heater in parallel circuits, and provided with an automatic interrupter operated by the glower-circuit current, and an auxiliary interrupter for the heater circuit operated independently of the glower circuit. (12.) The combination of multiple glowers which require to be heated to be rendered conductive, a heater for bringing one or more thereof to a conducting temperature, and means for automatically withdrawing the heater from action when only a portion of the glowers have been brought to such temperature. (13.) The combination, in an electro-magnetic cut-out, of a magnet or solenoid, and a core or armature adapted to be operated thereby, the said core or armature being maintained in a predetermined angular position by magnetic means. (14.) In a multiple-glower lamp, a plurality of glowers, and a circuit-breaking coil in circuit therewith, having strands equal in number to the glowers, said strands being in multiple with each other. (15.) In a multiple-glower lamp, a number of glowers adapted to operate simultaneously, a heater for the said glowers, or a portion thereof, included in a suitable heating circuit, a circuit-breaker in the heating circuit connecting with a suitable core or armature, and a circuit-breaking coil in circuit with the glowers, the said coil having strands equal in number to the glowers, and each strand arranged in series with a separate glower. (16.) In a lamp of the Nernst type, a glower, a heater circuit, including a heater near the glower, a switch in the heater circuit, a solenoid or magnet having its core or armature connected to the movable part of the switch, and a catch or detent engaging the core or armature after its initial operation, and adapted to be tripped by the opening of the switch. (17.) The combination with a source of electric current, and a circuit therefrom including one or more glowers, of an electric heater near the glower or glowers, a converter supplying said heater, and a switch controlling the circuit of the heater. (18.) An electric lamp of the Nernst type, comprising a glower, a heater, and a heater cut-out, having its actuating coil traversed by both heater and glower currents. (19.) The process of operating multiple-glower electric lamps of the Nernst class which consists in causing the current passing through a single glower or group of glowers to cut out the other glowers or groups thereof. (20.) The process of operating multiple-glower electric lamps of the Nernst class which consists in selecting that one of the glowers which is sure to be the last to light, and placing it in series with the cut-out coil for the heater circuit, whereby the operation of the lamp is placed under the control of a selected glower which is preferably of lower efficiency than the rest, in order that it may constitute a permanent element of the lamp.
(Specification, 15s. 6d.; drawings, £1 1s.)

No. 12910.—23rd August, 1900.—ALEXANDER JAY WURTS and MARSHALL WILFRED HANKS, of Pittsburgh, Pennsylvania, United States of America, Electrical Engineers. Improvements in terminal connections and supports for Nernst lamps.

Claims.—(1.) In an electric lamp, a removable portion comprising one or more glowers, a support therefor, a heating conductor carried by the support, one or more steadying resistances, also carried by the support, and means for forming electrical and mechanical connections between the removable part and its fixture. (2.) In an electric lamp, the combination of multiple glowers, a supporting-frame therefor, a steadying resistance in series with each glower, independent of the others, said steadying resistance being carried by the glower-supporting frame, and an enamel coating for said steadying resistance. (3.) In an electric lamp, the combination with one or more glowers of means for heating the glowers, steadying resistances included in the respective circuits of the glowers, all united in one structure, and means for coupling the structure to a suitable fixture. (4.) The combination of a glower-supporting plate, lugs or ribs on the face thereof, and a heating conductor placed in the spaces between the ribs. (5.) In a glower-and-heater support, a plate having ribs upon one face, and slots in opposite edges. (6.) The combination of one or more glowers, a support therefor, a heating-device for the glower, carried by said support, steadying resistances for the respective glowers, also carried by the said support, and a detachable coupling-device for securing the support to a fixture. (7.) The combination of a glower-supporting plate and a contact supporting plate, the contacts carried by the latter being insulated from each other, and a portion of the binding-posts carried thereby being multiple binding-posts. (8.) The combination of a disc of heat-resisting material for supporting the glowers and circuit terminals, a disc of heat-resisting material carrying a heater in proximity to the glowers, and a web, also of heat-resisting material, interposed between the said discs. (9.) The combination of a disc or plate, a heating-device supported thereon, one or more glowers supported in proximity to said heating-device, a plate remote from the radiating effect of said glowers, and ballast wires equal in number to the glowers, and supported upon the said plate. (10.) The combination of a number of glowers arranged in multiple series, ballast wires in circuit therewith, and a support for the glowers and ballast wires. (11.) The combination with a number of glowers, arranged in multiple series, of a heat-resisting plate, the members of each series of glowers being arranged on opposite sides of the said plate. (12.) The combination with a number of glowers arranged in multiple series, ballast wires interposed between the inner terminals of the members of the series, and a support on which the said parts are mounted. (13.) The combination with a glower of a yielding ballast wire, connected directly to the glower terminal, and a support carrying the described parts. (14.) The combination with a number of glowers arranged in multiple series, of ballast wires interposed in each cross-circuit, the several cross-circuits being insulated from each other at all points between the branching points thereof, the whole being carried by a suitable support. (15.) The combination with a fixture supplied with circuit terminals, and a removable lamp of the Nernst type provided with corresponding terminals, the said terminals being split tubes, and posts engaging therewith. (16.) A terminal connection for Nernst lamps, such as is illustrated in Fig. 10. (17.) In a lamp of the Nernst type, a plate carrying one or more glowers, and a heater therefor, the terminal or lead wires for the said heater and glower or glowers ending in plugs of aluminium or similar material, whereby the plate and the parts which it carries may be attached to a support. (18.) A removable element for Nernst lamps substantially as shown and described.
(Specification, 9s. 6d.; drawings, £1 1s.)

No. 12911.—23rd August, 1900.—ALEXANDER JAY WURTS, HENRY NOEL POTTER, EDWARD BENNETT, and MURRAY CHARLES BEEBE, of Pittsburgh, Pennsylvania, United States of America, Electrical Engineers. Improvements in Nernst lamps, and heaters therefor.

Claims.—(1.) The process of making electric heaters for Nernst lamp glowers which consists in applying a conductor in the form of a spiral or helix to one face of a ceramic, plastic non-conducting rod or tube, bending said rod or tube and its affixed spiral into the desired form, and rendering said form permanent by heat. (2.) An electric heater for Nernst lamp glowers in which a thin, light insulating body of curved cross-section is interposed between the glower and the heating conductor. (3.) In combination with a tubular heater-body of light, insulating, refractory material, terminal wires projecting through perforations adjacent to the ends of the tube and fused therein, and a heater-wire having its ends joined to the terminal wires. (4.) The combination with a glower of the Nernst type of an electric heater detachably held in proximity thereto. (5.) The combination with a glower of the Nernst type, and an electric heater therefor, of three circuit terminals for the said glower and heater, carried by an insulating base, one of the said terminals being common to the heater and the glower, and the other two being separately connected to the heater and the glower. (6.) An electric heater for Nernst lamp glowers consisting of a thin, light insulating body of curved cross-section, the said body being provided upon its outside with grooves transverse to its longitudinal axis, in combination with a heating conductor wound back and forth within the said grooves. (7.) An electric heater for Nernst lamp glowers, comprising convolutions of a “composite wire,” composed of a rod of insulating material and a spiral of conducting material