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No. 15422.—19th September, 1902.—THE STROWGER AUTOMATIC TELEPHONE EXCHANGE, a corporation organized under the laws of the State of Illinois, having their offices at 375, The Rookery, Chicago, Cook County, Illinois, United States of America, Manufacturers (assignees of Alexander Elsworth Keith, Electrical Engineer, John Erickson, Electrical Engineer, and Charles Julius Erickson, Electrical Engineer, all of 142, Washington Street, Chicago aforesaid). Automatic telephone exchange.

Claims.—(1.) In a telephone exchange having a series of circuits leading from subscribers' stations, a series of selectors, one for each station, and automatically operated independent means for selecting the connection between the selectors. (2.) In a telephone exchange having a series of circuits leading from subscribers' stations, a second series of selectors, and a series of connectors, and automatic means for placing every first selector in electrical connection with every other first selector through the second selectors and connectors. (3.) In a telephone exchange having a series of circuits leading from subscribers' stations, a series of selectors, one for each station, and a number of lines adapted to electrically interconnect the selectors, and automatically operated independent means for selecting one of such lines. (4.) In a telephone exchange having a series of circuits leading from subscribers' stations, a series of selectors, one for each station, and a number of lines adapted to electrically interconnect the selectors, and automatically operated independent means adapted to make no connection with a busy line, but select a line not busy. (5.) In a telephone exchange having a series of circuits leading from subscribers' stations, a series of selectors, one for each station, and a number of lines adapted to electrically interconnect the selectors, and automatically operated independent means for selecting one of such lines, consisting of an electro-magnet, a source of electric current, a circuit-breaker, and a controlling switch, operated substantially as stated. (6.) In an automatic telephone exchange, the combination with a series of subscribers' lines leading therein of a series of selector switches, one for each subscriber, magnets in each of said switches for moving a main-line switch-arm in two directions, one of said movements controlled directly by the subscriber, and the other movement automatically controlled by mechanism at the exchange. (7.) In an automatic telephone exchange, the combination with a series of subscribers' lines leading therein of a series of selector switches, one for each subscriber, a number of lines adapted to interconnect the selectors, and means adapted to make such connection, consisting of an electro-magnet fitted to operate the main switch-arm and whose armature is adapted to hold closed or open the electric circuit therethrough. (8.) The combination in a telephone exchange having a series of subscribers' lines leading therein, and such lines having insulated terminals arranged in rows and adapted to being electrically connected with, of a body of metal between the rows, for the purpose stated. (9.) The combination in an automatic telephone exchange having a series of subscribers' lines leading therein, and having a system of interconnecting switches, of which latter each is provided with rows of separately insulated contact points, each adapted to be contacted by arms which complete the interconnecting circuit, a condensing body disposed between each of the said rows for the purpose stated. (10.) The combination in a telephone exchange having a series of subscribers' lines leading therein which have insulated terminals arranged in a plurality of rows and adapted to being electrically connected with, of a condensing body between the rows, and a plurality of such bodies in electrical communication for the purpose stated. (11.) The combination in a telephone exchange having a series of subscribers' lines leading therein of insulated terminals in the lines arranged in pairs, each adapted to being electrically connected with any other pair, the pairs of terminals arranged in a plurality of rows, a condensing body between the rows, and a plurality of such bodies in electrical connection.

(Specification, £1 12s.; drawings, 11s.)

No. 15423.—19th September, 1902.—HENRY LANE WALTER, of 1335, North Pennsylvania Street, Indianapolis, Indiana, United States of America, Capitalist (assignee of Joseph Wilson Nethery, of 65, Blancherne Building, Indianapolis aforesaid, Building Superintendent). Valves.

[No. 78

Claims.—(1.) In an automatically closing valve with a single main-valve seat wherein a starting-valve opens a by-pass above a piston-head and thereby allows the main valve to rise from its seat, means of the nature described whereby the flow of fluid is substantially cut off at the extreme open position of said main valve. (2.) In a valve of the nature described, a double-walled casing wherein the inner and outer walls are united at or near the ends and longitudinally along one side and have a by-pass through such longitudinal casing, the inner wall being nearly divided by a narrow circumferential slit through which the fluid enters the chamber therein. (3.) In connection with the subject-matter of claim 1, the provision of two cut-off points above the main-valve seat with gradually tapering spaces between them whereby as the valve moves towards either end of its traverse the available fluid-passage-way is decreased. (4.) In connection with the subject-matter of claim 3, the guide-wings traversing the tapering spaces. (5.) The centrally pivoted spiral-edged cut-off gate to adjust the size of the orifice opening through the piston-head. (6.) The half-rings or fillers of varying thickness applied to the main valve for the purpose described. (7.) As a modification of the subject-matter of claim 6, the graduated cone 40, as set forth.

(Specification, 11s.; drawings, 2s.)

No. 15424.—19th September, 1902.—GEORGE MITCHELL, of Naco, Arizona, United States of America, Metallurgist, and Lucius Day Copeland, of Los Angeles, California, United States of America, Mechanical Engineer. Method, process, and apparatus for utilising the heat of slag for generating steam.

Claims.—(1.) The process of generating a constant supply of steam under pressure from the heat contained in hot slag, consisting in intermittingly feeding charges of hot slag into a body of water confined under pressure in a steam-generator adapted to be closed steam-tight while charges of slag are being fed into the body of water and discharged therefrom, substantially as set forth. (2.) The process of generating a constant supply of steam under pressure from heat contained in hot slag and in granulating the slag, which consists in intermittingly feeding charges of hot slag into water confined under pressure in a steam-generator adapted to be closed steam-tight while charges of slag are being fed into the water and discharged therefrom and in intermittingly discharging granulating slag from such confined body of water, substantially as set forth. (3.) The combination with a steam-generator, a slag-receptacle arranged to feed hot slag into water contained in the generator, and means for controlling the discharge of the granulated slag, of suitable valves for maintaining the pressure within the generator while slag is being fed into and discharged from the same, substantially as set forth. (4.) The combination with a steam-generator and means for feeding hot slag by its gravity into the generator and discharging granulated slag by its gravity therefrom, of means for maintaining the steam-pressure within the generator while the slag is being fed into and discharged therefrom, substantially as set forth. (5.) A slag steam-generator constructed to have slag fed into a body of water under pressure and discharged therefrom and provided with removable lining sections, substantially as set forth. (6.) A slag steam-generator having a slag-receptacle, in combination with a valve located inside the generator, and means for rotating the valve on its seat, substantially as set forth. (7.) The combination with a steam-generator and a slag-feeding receptacle, of means for introducing steam above the slag-receptacle to equalise the pressure thereon, substantially as set forth. (8.) A slag steam-generator having a slag-feeding receptacle for feeding hot slag into a body of water in the generator, and a device for breaking up the slag while being fed, substantially as set forth. (9.) A slag steam-generator constructed to feed hot slag into water in the generator while confined under pressure and provided with valve-controlled receptacle into which the cooled slag is discharged, substantially as set forth. (10.) A slag steam-generator provided with means for discharging the slag from the slag-feeding receptacle within the generator, substantially as set forth. (11.) The combination with a slag steam-generator, of means for agitating the cooled slag and assisting in its discharge, substantially as set forth. (12.) A slag steam-generator having a tilting slag-receptacle inside the generator, and means for seating its open end over the feed-opening in the generator-casing, substantially as set forth.

(Specification, 9s.; drawings, 7s.)

No. 15434.—23rd September, 1902.—GEORGE CHRISTOPHER CLARKE, of Sentinel Road, Ponsonby, Auckland, New Zealand, Settler. Improvements in or relating to gates.

Claims.—(1.) In the construction of gate-frames, a number of double wires extending in parallel lines longitudinally across the frame and secured to the uprights at both ends thereof, and means whereby each of such double wires may