reduce the loss of heat in smoke, flame, or heated air, to a minimum.

To quicken still further the absorption of heat by the water, the upper part of the flues, or head flues, is covered with wire threads, woven or united in such a manner, that the points of the vertical wire-threads repose upon or touch the upper parts of the flues, and, projecting into the water, thereby communicate the heat more rapidly to it by radiation.

These external water pipes, or external auxiliary flues, surrounded by water pipes, can be added to every kind of boiler now in use, whether stationary, locomotive, or marine, its application to each of which is shown in the specification.

The claim is, 1. To the exclusive use and application of a new mode or principle of supplying the water successively through any given number of separate closed vessels, or water passages, to the steam-chamber, or that part of the steam-boiler where the steam is allowed to disengage itself from the water; when this mode or principle is applied in conjunction with the construction and arrangements as hereinbefore described, viz. when the water, in its way from the chimney to the steam-chamber, takes the opposite course to the flames, smoke, or heated air, which issue from the fire-box and proceed to

the chimney, and when the water is so conducted as to be continually in contact with the heated air or vapours, in such manner, that in its course to the steam-chamber it is gradually increasing in heat. And when, on the other hand, the heated air or gaseous matter, in its course from the fire-box, is continually decreasing in heat, the nearer it comes to the chimney. 2. To the invention and construction of double pipes, as before described, for the conveyance of water to the steam-chamber; and of smoke or heated air to the chimney; and of the separating or water chambers made in the interior of the boiler itself." But I limit not my exclusive right to this new mode and principle in the supply of water and conveyance of heat exactly to the specimens which I have given of its application, in the construction and shape of boilers, as well as of water vessels or pipes through which the flues pass. But I distinctly disclaim any exclusive right to any other part of the construction of steamboilers herein described, and of the covering of the flues in the steam-boiler with wirecloth, unless such covering of the flues is applied, as aforesaid, in conjunction with my new mode and principle of supplying water, which to the best of my belief is new, not only in England, but in any country in the world!"

Registra- on the Register.

Time for which protection is granted.

1 years. 3

Subject of Design.

Ditto

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Ditto

1081

Thomas Marsh

Letter and money balance

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Blackwall, and proceeded down the river in excellent style, for the purpose of ascertaining the efficiency of her engines. The "Memnon" was built by Mr. Fletcher, and her engines, which are of 400 horses power, have been constructed by Messrs. Maudslay, Sons, and Field. The boilers, which are of copper, are furnished with a change water apparatus, by which the salt water is kept from exceeding a certain point of saturation, and the formation of any injurious deposit is thereby prevented. There are four steam cylinders working in pairs, the piston-rods being attached to a T-piece, from the lower end of which a long connecting-rod proceeds up to the main crank-shaft. The engines are fitted with expansion gearing, so as to admit of the consumption of fuel being regulated to suit every circumstance of slow or quick steaming. The paddle-wheels, which are of the ordinary kind, and 26 feet in diameter, are fitted with the disconnecting gear recently patented by Mr. Maudslay, and described at page 303 of our 35th volume. On arriving at Long-reach, the full power of the steam was applied, when the engines worked with a beautiful motion, the vibration being scarcely perceptible. The vessel, with her heavy cargo, was propelled by steam alone at the rate of 114 miles per hour, to the great satisfaction of her able commander, Captain Powell. Among the gentlemen on board were Captain Pepper, of the "Ackbar," another new (Clydebuilt) vessel of the same dimensions, belonging to the East India Company; Captain Brasco, attached to the Neapolitan Government; Mr. Mason, secretary to the Indian Marine; Mr. Fletcher, the builder; Messrs. Maudslays and Mr. Field, the engineers; and several scientific persons. The "Memnon" proceeded as far as the Little Nore, and during the trip, the precision and simplicity with which the disconnecting gear removed the stupendous paddlewheel from the engine, and again attached it in an incredibly short space of time, greatly surprised such of the naval officers as had never witnessed any thing of the kind before. On reaching Sheerness, the "Memnon" was put about, and returned to Gravesend, where she will complete her stores of ammunition, &c., and in a few days proceed direct to the seat of war in China, where she will doubtless prove a powerful auxiliary to the naval force assembling in that quarter.

Whitelaw and Stirrat's Water Mill. There has recently been erected at the manufactory of Mr. Charles Matthews, Kensham Mills, Bradninch, near this city, one of Messrs. Whitelaw and Stirrat's Patent Hydraulic Machines. This ingenious piece of mechanism is intended, and, from what we can learn, it is believed will supersede the use of the common water-wheel, forming a better application of water power. The inventors seem to have kept in view simplicity and durability, combined with economy. From its many advantages over the water-wheels now in use, it is deemed an invention of great importance, and it is thought will shortly be brought generally into use, although this, which Mr. C. Matthews has so spiritedly caused to be erected at Kensham, is believed to be the only one at present at work in England. The ingenious inventors are of Scotland, and have establishments, it is believed, both at Glasgow and Paisley. The machine at Kensham, we are desired to state, Mr. Matthews will be most happy to show and explain to any gentleman who will favour him with a call.-Exeter Flying Post. [The machine above alluded to was made by Messrs. Donald and Craig, here, who have made a number of these water mills, all of which are giving every satisfaction to the parties using them. They have a number of them in hand, from 6 to 60 horses power, which will soon be erected in different parts of the country.-Paisley Advertiser.]

Uniformity of Time-" Now that railway travelling has become so universal in the kingdom, doing so much to annihilate space, the question of time became a matter of considerable importance, and he had long been of opinion that some plan must be adopted to prevent the errors and inconvenience of every town in the kingdom setting its clocks to a meridian of its own, different to every other place out of the same longitude. To show the extent of the evil to which he adverted, it would perhaps be sufficient for him to state that there was a difference of 25 m. 28 sec. between the times at Dover and Falmouth; that is to say, when it was noon at Falmouth, it was 25 m. 28 sec. past noon at Dover. There was nearly a minute difference in time between the east and west of London, and about a quarter of a minute difference between the east and west of Birmingham. The railroad directors had endeavoured to remedy this defect by keeping London time at all their stations; but there was this great inconvenience attending it, that all persons who resided west of London were in great danger of being too late for the trains. On all the time tables of the Great Western Railway an endeavour was made to remedy this difficulty by printing the correction for longitude. It occurred to him a year or two ago that it would be a very excellent plan if government would recommend the adoption of one uniform time throughout the kingdom; and he was happy to find that his friend, Mr. Dent, had turned his attention to the same subject, and he quite agreed with him that they ought to adopt one meridian as a universal standard, and call it "British time." Happening to mention this subject to his friend, Mr. Rowland Hill, as a matter of some importance in connection with the postoffice department, he informed him that he had received a letter from Captain Basin Hall, in 1840, on this very point; and as it embodied all that he (Mr. Osler) wished to say respecting it, he would, with the permission of the audience, read the letter to them. The lecturer here read the letter of Captain Basin Hall. The idea of the adoption of a general standard for time throughout Great Britain originated with the late Dr. Wollaston, who suggested that all the post-office clocks throughout the different counties should be kept at London time, a measure which he considered might be very easily accomplished, and which would greatly simplify all those arrangements of the post-office in which time was included as an element. He proposed to regulate all the post-office clocks in the kingdom by means of the time brought from London daily by the mail coach chronometers; and he had no doubt, that ere long, all the town clocks, and eventually all the clocks and watches of private persons, would fall into the same course of regulation; so that only one expression of time would prevail over the country, and every clock and watch indicate by its hands the same hour and minute at the same moment of absolute time."-Mr. F. Osler's Lect. Birm. Phil. Inst.

Intending Patentees may be supplied gratis with Instructions, containing every particular necessary for their safe guidance, by application (post-paid) to Messrs. J. C. Robertson and Co., 166, Fleet-street, by whom is kept the only COMPLETE REGISTRY OF PATENTS EXTANT, (from 1617 to the present time.) Patents, both British and Foreign, solicited. Specifications prepared or revised, and all other Patent business transacted.