WEEKLY LIST OF NEW for improvements in preserving fermented and other liquids and matters in vessels. July 29; six months. Edward Gribben Wilson, of Bury, Lancashire, tin-plate worker, for certain improvements in the ENGLISH PATENTS. construction of tin drums or rollers used in the machinery for drawing, spinning, doubling, twisting, and throwing cotton, wool, silk, flax, and other fibrous substances. July 29; six months. WEEKLY LIST OF DESIGNS FOR ARTICLES OF UTILITY REGISTERED. R. (John Rock Day .......... Warwick-street, Belgrave-sq.... Syphon trap. Lowther Arcade, Strand and Job Clark ............ Willenhall........ George Harborow ....... Holborn-bars Bradford William P. Stanley...... Peterborough Crown-street, Walworth-road) Advertisements. Portable meat screen. Spring clip for candlesticks. Bolt or fastening. A pair of braces. TO ARCHITECTS, BUILDERS, &c. Copper-Wire Cord. S. NEWALL & Co.'s PATENT IMPROVED COPPER-WIRE CORD for WINDOW SASH LINES, Hot-houses, Lightning Conductors, Hanging Pictures, Clock Cord, and various other purposes for which hempen rope has hitherto been used. This new and valuable Patent is fast superseding the use of the hempen cord, and is strongly recommended to all Builders and other parties connected with the above. The Wire Cord may be had wholesale, and specimens seen at the Office of the Patentees, No. 163, Fenchurch-street, W. T. ALLEN, Agent; or retail of G. and J. DEANE, 46, King William-street, and E PARKS, 140, Fleet-street; also of all respectable Ironmongers. GUTTA PERCHA COMPANY'S WORKS, WHARF ROAD, CITY ROAD. London, 1st April, 1848. THE GUTTA PERCHA COMPANY have great pleasure in stating that the steadily increasing demand for the PATENT GUTTA PERCHA DRIVING BANDS justifies the utmost confidence that they are fully approved. Their durability and strength-permanent contractility and uniformity of substance their non-susceptibility of injury from contact with Oils, Grease, Acids, Alkalies, or Water-and the facility with which the single joint required can be made in Bands of any length-render them superior for almost all working purposes, and decidedly economical, GOLOSHES, TUBING of all sizes, BOUGIES, CATHETERS, STETHESCOPES, and other Surgical Instruments; MOULDINGS FOR PICTURE FRAMES and other decorative purposes; WHIPS, THONGS; TENNIS, GOLF, and CRICKET BALLS, &c., in great variety. Patent Gutta Percha Shoe Soles. The applicability of Gutta Percha Soles for Boots and Shoes having been extensively and satisfactorily tested, we can unhesitatingly recommend the material prepared for this purpose, its merits having been acknowledged by all who have tried it. Indeed, experience has proved that Gutta Percha Soles wear twice as long as leather, with great additional personal comfort; and they remain perfectly impervious to wet until quite worn through. Boot and Shoe Soles for Summer Wear. The fact of the total imperviousness of these Soles to water, enables the most delicate, by the use of them, to escape the suffering which the proverbial uncertainty of our climate, EVEN IN SUMMER, so often inflicts upon the incautious, and this effect may be secured by a Sole so thin and light, as to afford to the wearer a degree of ease and comfort hitherto unattainable, in conjunction with security against damp. At the same time, the remarkable non-conducting properties of Gutta Percha afford a most valuable protection to those who are subjected to suffering or inconvenience by walking upon heated pavements. The question of the durability of Gutta Percha Soles, as compared with Leather, has long since been decided in favour of the former; and no instance of failure has yet come to the knowledge of the Company which may not be ascribed to a neglect of their printed Directions. To Inventors and Patentees. MESSRS. ROBERTSON & CO., (Of which firm Mr. J. C. ROBERTSON, the EDITOR of the MECHANICS' MAGAZINE from its conmencement in 1823, is principal partner,) undertake The procuration of Patents For England, Scotland, Ireland, and all Foreign Countries, and the transaction generally of all business relating to PATENTS. Specifications Drawn or Revised. DISCLAIMERS, AND MEMORANDUMS OF ALTERATION PREPARED AND ENROLLED. Caveats Entered and Oppositions Conducted. CONFIRMATIONS AND PROLONGATIONS Searches made for Patents, and Copies or Advice on Cases submitted, &c. &c. MESSRS. ROBERTSON & CO. POSSESS THE ONLY COMPLETE REGISTRY OF PATENTS EXTANT, Commencing A.D. 1617 (15 James I.) and regularly continued down to the present time. INTENDING PATENTEES supplied gratis with Printed Instructions, on Application, either personally or by letter. Lately published, Third Edition, Price 7s. 6d., Microscopic Illustrations, WITH descriptions of the New Microscopes, and ample Instructions for Use. By ANDREW PRITCHARD, M.R.I. Also, by the same, Price 12s., A HISTORY OF INFUSORIA, Living and Fossil, with Descriptions of all the known species of Animalcules, and upwards of 500 Engraved Figures. NOTE.-Part I. of the above work, entitled "A GENERAL HISTORY OF ANIMALCULES," with the Engravings, may be had separately, Price 5s. London: Whittaker and Co., Ave Maria-lane. To Engineers and Boiler- LAP WELDED IRON TUBES, FOR MARINE AND LOCOMOTIVE STEAM - BOILERS, Tubes for Steam, Gas, and other purposes; — all sorts of Gas Fittings. The Birmingham Patent Iron Tube Company, 42, Cambridge-street, Birmingham, and Smethwick, Staffordshire, manufacture Boilers and Gas Tubes, under an exclusive License from Mr. Richard Prosser, the Patentee. These Tubes are extensively used in the Boilers of Marine and Locomotive Steam Engines in England and on the Continent; - are Stronger, Lighter, Cheaper, and more Durable than Brass or Copper Tubes, and are warranted not to open in the weld. 42, CAMBRIDGE-STREET, CRESCENT, BIRMINGHAM. Works-Smethwick, Staffordshire. LONDON: Edited, Printed, and Published, by Joseph Clinton Robertson, of No. 166, Fleetstreet, in the City of London.-Sold by A. and W. Galignani, Rue Vivienne, Paris; Machin and Co. Dublin; W. C. Campbell and Co., Hamburgh. Mechanics' Magazine, MUSEUM, REGISTER, JOURNAL, AND GAZETTE. No. 1305.] SATURDAY AUGUST 12, 1848. [Price 3d., Stamped, 4d. Edited by J. C. Robertson, 166, Fleet-street. WALKER'S PATENT We recently made favourable mention (No. 1301, p. 53) of a new hydraulic engine of extraordinary power which we had seen at work on the premises of Mr. Walker, the inventor, and which has been constructed by him for the drainage of some marsh lands in Norfolk. We now extract from Mr. Walker's specification the following complete description of the engine: On Fig. 1 is a front elevation of the engine; fig. 2 is a side elevation; Fig. 3, a sectional side elevation on the line e, f, of fig. 1. A A is a foundation of strong planks, supporting a quadrangular cast-iron well, B B, which is sunk into the ground to such a depth as may be necessary for the purpose required. The well, B B, has three openings, c c c, one in front, and one on each side, fitted with sluice doors hinged on their upper edges at d' d', one or more of which can be opened or closed at pleasure. the upper flange of the well, B B, rests a strong frame of timber, E E, from which stays, e' e', pass down to the foundation timbers and give stability to the superstructure. Upon the frame, E E, are erected cast-iron framed standards, F F, secured to the well, B B, by nuts and bolts passing through the frame, E E. The standards, F F, are in two heights, and upon a flooring at g g, there are two steam cylinders, H H, with pistons, each of which is connected by two piston-rods, h h, to its respective crosshead I. From a bolt in the centre of the cross-head, I, which works in guides in the side framing of the standards (not shown in the figures) a connecting-rod, J, passes up to a crank on the outer end of the shaft, K, which shaft carries a fly-wheel, L. From the outer ends of the cross-head I, two connecting-rods, M M, pass down to a large cross-head, N N, beneath the steam cylinders; from this cross head two other rods, nn, pass down, and are bolted to a cruciform platform, o o. Upon the platform, o o, are bolted four upright iron rods, ppp p, the upper extremities of which support a valved piston, P, hereinafter more fully explained. Immediately beneath the steam cylinders, and supported by their upper flanges, upon the frame, E E, are two water cylinders, Q Q, open at the bottom, and having at top a valve, opening upward. This valve is similar in its construction to those in the pistons afterwards described. Upon the upper flanges of the water cylinders, Q, is bolted a valve-box R, communicating by an exit-main 8, with what I term a dividing box, S, furnished like the well B, before described with doors on each side, and in HYDRAULIC ENGINE. front capable of being opened and closed at pleasure. On the top of the valve box are covering plates, rr, the removal of which gives access to the cylinder valves. Steam from a boiler is admitted through the induction-pipe t, to a slide-valve T, placed beneath and between the steam cylinders, by means of which the steam is admitted alternately to the bottom of each. The slidevalve, T, is worked by an eccentric V, on the crank-shaft K, through the medium of the rod v. The steam cylinders, H, are fitted with cones through which the pistonrods, h, work; the hot air passing from the upper part of one to the other through the air-tube, w, as the pistons alternately rise and fall. After leaving the cylinders the waste steam passes from the slide-valve, T, along the eduction-pipe, &, through the water-box, Z, whence it passes into the pipe, 22, which may be led into a chimney or other convenient outlet. The cold water raised by the pump, 62, flows into the upper part of the water-box, Z, and into the tubes which descend nearly to the bottom thereof where it becomes heated (by the spent steam passing through the box,) nearly, or quite to the boiling point, in which state it is forced into the boiler by the feed-pump, aa. Figures 4 and 5 are enlarged representations of the piston and valves; fig. 4 being a plan, and fig. 5 a sectional elevation thereof. This valve consists of a number of cast iron bars forming a sort of grating strengthened on the underside with cross bars, and having bosses to receive the screwed ends of the supporting-rods, p p. The upper surfaces of the bars are ranged in pairs on two alternate levels, the edges of the openings being formed into circular seatings, in which are laid lengths of iron tubing plugged with wood, which close the openings between the bars and form a water-tight joint in a downward direction, but open freely upward. To keep the lengths of tubes in their places endways, a deep wrought-iron band, or ring, e2 e2, is shrunk round the valve, while two bridges, ff, retain the tubes vertically, and limit their range of action. The bars between the openings are wedge-shaped on their under surfaces, so as to offer the smallest possible resistance to the ascending column of water. The wrought-iron band, e2, of the piston valve is turned true on its external surface, so as to move freely up and down on the cylinders, but does not require any packing. I will now endeavour briefly to describe the mode of operation. The steam in a boiler being at a pressure of twenty-five pounds, or thereabouts upon the square inch, is admitted to the slide-valve, T, through which |