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MODE OF DISCONNECTING PADDLE-WHEELS, journey, upwards of 10 miles 'an lour. The swiftest travelling was between MODE OF DISCONNECTING PADDLETottenham and Waltham, some part of

WHEELS. which road was gone over at the rate of Sir,-Perceiving by the Report of nearly 25 miles an hour.

Down some Messrs. Pringle and Parkes in your July hills was done at greater speed even than number, that an easy and rapid means this, by mere gravity, the steam being of disconnecting the paddle-wheel of a completely shut off, and drags on—which steam vessel is still a desideratum, I strained the engine nearly as much as the take the liberty of sending you a plan ascent of Wade's Mill-Hill.

for effecting the same, which, if worthy This steam journey, although it is of notice, you will perhaps do me the one of the worst Mr. Hancock ever per- favour to insert in your valuable work, formed, will be the most useful to him. of which I am a constant reader. The It will show him more of the difficulties

idea is original with me, but in this likely to arise in common road steam inventive age it is highly probable that traffic, than he has hitherto seen, and he I have been long since anticipated, and will be enabled the better to avoid them

as “there is nothing new under the in future, than had they not been expe- sun," I am quite prepared, for at least a rienced. Judging from this trip, it dozen claimants if you should give it would seem that a greater distance than

your countenance by inserting it in the about 30 miles, should not be performed Mechanics' Magazine. without either a change of engine, or at

I remain, Sir, least of fire-bars. Lead flange packing Your most obedient servant, should also be avoided, and some substitute for hemp packing devised for the

John TALLERVEY, Lt. R.N. piston-rod and valve-boxes. At Cam.

Westbury on Tyne, Bristol, Aug. 22, 1839. bridge the cylinders were repacked with AAA, paddle shaft, which is to be copper wire, a most effectual mode.

square excepting at the bearings. B, The quantity of coke consumed on the barrel of paddle-wheel, from which the journey was sixty bushels. The tolls spokes are to radiate; 1 and 2 circular paid amounted to 13s. 2d.

parts for bearings; this barrel to be Since Mr. Hancock's previous steam square in the inside. C, another square travelling, a very considerable change barrel with flanged end, this barrel to fit seems to have taken place in the public on to the shaft and into B. D D, two opinion, as far as it can be judged of screws, with toothed heads at E E. F, from a road-side crowd ; instead of the toothed wheel turning on paddle shaft hootings, hisses, and execrations which and gearing into EE. GG, two bearwere bestowed upon him in his previous ings, or supports, attached to paddle journies, he was greeted in his progress shaft for screws D D to turn in; H, a to Cambridge with applause and bless- moveable toothed wheel placed under ings and wishes for success.

paddle shaft to gear into and turn toothed The matter appears now to be taken up wheel F; this wheel H to be worked by by parties likely to bring steam locomo- a winch (should the engine not be tion on common roads to a practical stopped at the disconnecting, H would test, because it is their interest that it

gear into E E, equally well producing should succeed-namely, by the road same effect.) I1, vessel's side for end of trustees, inn, and coach proprietors. screws, D D, to butt against; b b, dotted The Automaton was to remain in Cam- lines, outline of B, and where it ought bridge for a few days, and to journey to be placed, but for the sake of clearness, about the neighbourhood to demonstrate all parts are stretched at a distance from the practicability and advantage of this each other. There is to be fixed a stopnovel mode of transit. On Tuesday a per for checking the wheel when intendparty of gentlemen of ('ambridge were ing to disconnect. The paddle-wheel favoured with a trip round Parker's being checked, and H put in gear and Piece and the neighbourhood, and on turned by the winch, will of course Wednesday the Automaton was to make turn the screws in the holes in the its appearance at the Newmarket race flange of C, which holes, are of course

to be tapped or threaded for the purpose, C will be drawn out of B, he ends of


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9 DD merely butt against the vessel's side must come in the way between the gunat II; when the wheel is discon- wale and crank bearing, and the bearing nected the flange of C will be drawn of the shaft at the sponsing must be difclose up to the supports GG. The re- ferent and independent of that of the verse of this will connect, and H being barrel of the wheel. The same effect may

be produced and the wheel disconnected by threading the shaft and barrel C, inside, the engines would then disconnect by merely checking the wheels and removing a key necessary to secure C; but if the engines broke down, and you wished to disconnect, the shaft would then have to be checked, and the wheel turned; this could only be done by machinery, and would be difficult in bad

weather. I have this plan sketched, but பாரம்

prefer the one sent.

J. T. Lieut. R.N.

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Sir,-Had it not been for a temporary absence from town, I should have taken an earlier opportunity of replying to the attacks of “Piston Rod" and "Bowsprit,” in your 838th number, but “ better late than never." I hope I am yet in time to request the insertion of a few brief remarks on the lucu. brations of these gentlemen.

It may be held superogatory for me to add my testimony in corroboration of the fact that “ Piston” and “ Observator" are not“ two single gentlemen rolled into one." Flattered as I might feel by being identified as the writer of the excellent letters which have appeared under the former signature, I need hardly tell you, Mr. Editor, that I can Jay no claim to the distinction. It may be worth while, however, to remark on the slenderness of the evidence by which “ Piston Rod” attempts to prove the presumed connexion; i. e., the use of the word “ again" by “ Piston,” when speaking for the first time of the British Queen. This would be very sorry circumstantial evidence at the best, but it is blown to the winds at once by a simple reference to the letter in question, when it appears that “ Piston" had before alluded to the British Queen, (in the beginning of his communication), had diverged to another subject, and had only used this important word "again” on returning once more to the Queen, in criticising Mr. Hall's justly-styled “ bold and inflated” letter on the wonderful powers of his condensers! The proof of all this is in the hands of every reader, and is contained within the compass of a single column of the Mechanics' Magazine (see vol. xxxi., page 324). After this, what are we to think of “ l'iston Rod" and his "proofs" ?

moved out of gear, the whole will re-
volve, occupying about the same space
in height as the crank which will re-
quire the deck to be raised at that part
above tbe shafts. No bearings or framing


The policy of the mode by which this in- board the British Queen, that of course the dividual endeavours to patch up the cause of former required blowing-out cocks to be put his friends in the north, is excessively short- to the boilers, and that the water" (on the sighted. He would have us believe that the voyage from Greenock to London) “was engines of the Great Western are in a most blown out too low by these cocks," from all distressingly dilapidated condition, hardly which it would appear that the injection able to hold together, and with their cylin- condensers were in operation on this voyage. ders and pistons furrowed and injured most Yet the express object of Mr. H.'s former deplorably. But what then? These engines letter (page 252) was to refute the erroneous in this miserably worn-out condition (ac- potion that such had been the case, and on cording to Piston Rod), were still able to that occasion, in order to set all doubts at beat the bran-new Glasgow-made ones of the rest, Mr. H. observed emphatically “I have British Queen! If this do not afford proof been on board during the whole of the passufficient of the great inferiority of the sages, and positively assert that not a single Scottish engineers, what will? They could stroke of the engines has been made, except not surely have had a better chance of by the working of my condensers." What, triumphing over their London competitors under these circumstances, becomes of the than this. According to our veracious in- “blowing out too low" story, by which the formant, the condition of the chef-d'æuvre injury done to the engines on these self of Maudslay and Field” is now somewhat same "excellent passages” is now accounted similar to that of the high-mettled racer for? bearing in mind that it is one of the wlien reduced to the sand-cart; and yet distinguishing excellences of the patent con(shocking to relate) the crack specimen of densers, that the boilers with which they are Scottish engineering, which he can never used never require blowing.out at all! * sufficiently admire, was left behind out of I remain, Sir, most respectfully yours, sight by this cripple, on the third day of their

OBSERVATOR. steam race across the Atlantic, and never London, Sept. 25, 1839. more had an opportunity of seeing anything of the vessel propelled by the worn-out, ricketty, seriously-injured, but somehow

COL. MACERONI'S INVENTIONS-MR. HAN. quick-going engines of London manufac

соск's STEAM-CARRIAGES - WOODEN ture!! Truly judicious is “Piston Rod's"

PAVEMENTS - WATERPROOFING BOOTS observation that “ well it has been said

HALL'S CONDENSERS, &c. &c. • Save me

my friends."'" My other antagonist, “ Bowsprit,” would

Sir,- The extraordinary prostration of be a formidable one, did it not happen that

body and mind caused by the too sudden all his facts are fictions. I need only refer

dismissal of three ounces of laudanum per to any of the newspapers of 15th and 16th

day for six years, has prevented me from August for proof that, according to the

offering my humble contributions to your American journals at least, the odds at New

valuable pages for many weeks past, save York were altogether in favour of the Bri. one which I am now sorry to have had the tish Queen; and, as to the assertion that

weakness to confer upon Mr. Walter Han. “the Great Western reached Bristol only

cock about his twelve steam-carriages. about two hours before the Queen arrived at

There are some little matters in your Portsmouth,” I cannot guess the motive

number of the 14th of this month, which for putting such a transparent figment upon

mangre my morbid apathy, I am induced by record. Any of the journals of the above

the clamour of my “friends” to notice. date will bear witness to the fact that the

First, there is much said about the " Great Western arrived early in the morning

light" on the advantages of wooden paveof the fourteenth of August, and the Queen

ments, which, for recommending to the early in the morning of the fifteenth, the

lieges of this country in a printed pamphlet, difference being twenty-four hours instead

reprinted in the Mechanics' Magazine, in of two, as I thought was known to all the

1825, I was most severely ridiculed in the world, until surprised by “ Bowsprit's” un

Monthly Repository of February, 1834 (I accountable and unfounded assertion to the

think). The first verses of the song which contrary.

the editor of that clever periodical indicted With respect to Mr. Hall, I cannot leave

in praise of my wooden plan, have already him in better hands than those of " Piston." However, I am tempted to ask him one * The boilers being supplied with “blowing out question. It would refer to what, at first

cocks," put it in the power of any evil disposed

person to open them, without there being any neces. sight, seems a contradiction in certain pas- sity for so doing. We need scarcely observe that there sages of his two last letters ; in one of these is no connexion between the engine and the opera

tion of “ blowing out, (page 404) we are told that “there are in- .

which, as “ Observator"

doubtless knows, is a manual operation performed jection condensers, as well as his own, on at the discretion of the Engineer.-[Ep. M. M.]




But as many

me :

appeared in the Mech. Mag.

for months, no sea water being used, but of your readers who now read in all the that which is requisite to condense the waste newspapers of the “ patents," "contracts," steam, by being passed through the drums “advantages," &c., which I set forth to the containing the clusters of copper tubes, public, and you, Mr. Editor, approved of, which condense the steam. fifteen years ago, I repeat this day the joke I should not have spoken of Mr. Hall's of the Monthly Repository for February, “ invention," had I not been on the point 1834 ; the writer supposing the inhabitants of making public use of this plan for some of St. Giles's holding out their dusky bands steam vessels I am about to build, furnished before a Christmas fire made of the wooden with my new patent absolute safety and expavement, and singing a song of praise to tra powerful boilers.

By the by, I see in your number of the “ London streets is paved with wood,

14th instant, that one of wise men of “The Long live Maceroni :

British Association,” a Mr. John Isaac For we'll blow out with summut good, Hawkins, illuminates the leiges with a disSaved out of our coal money."

covery of the advantages of wooden paveNow, Mr. Editor, all originality about ments for streets, a subject which you, Mr. wooden pavements apart, as you have very Editor, so ably discussed and approved of sagaciously observed in your preface to my in remarking on my “ Hints to Paviours," Hints to Paviours, the only way to form a so far back as 1825! Moreover, I see in firm and even sub-stratum for any pavement, your No. of this day (Sept. 21) that a either of stone or wood, suitable to our Frenchman has got the job of rendering streets, with so many gas and water pipes, hard and dry, the gravel of the Birdcage &c., is to be obtained and preserved by my Walk, and the Parade in St. James's Park, very powerful mechanical flying stone driver, by means of hot coal tar ! Now I did this as you named it. Thus, I beg leave to tell to Mr. I. R. Pell's garden walks at Blackall the dupes of the pretended wooden pave- heath, in 1816. I strongly recommended ment projectors--first, that they have not a it in your pages in 1825; and in June 1838, shadow of a claim for a patent; secondly, I proposed the operation to Lord Hill, as that their wooden blocks will no more keep may be seen in the Naral and Military their level than the stones, without the use Gazette of the 7th of July, 1838. In the of my machine to compress the sub-stratum, same letter, I proposed to render waterand then the blocks. Further, that I shall proof and thrice more durable the boots and soon be in a position to contest the point shoes of the troo's, for sixpence a pair, by with them, and beat them from the field, means of my simple fusion of tallow and covered with ridicule. At any rate, the resin, often spoken of in your and other pages of your excellent Magazine must con. useful periodicals, and so much approved of vince those who read them, that I have far by your practical intelligent correspondent, more claim to some of the advantages re- Mr. Baddeley. Lord Hill addressed me the sulting from improved paving, whether of following reply :stone or wood, than any other man existing. “ Lord Hill has received Colonel Mace. Biit for thirty years I have been “throwing roni's proposals, but cannot give him any pearls to swine,” and preaching to the employment. desert air, on many matters interesting to

“ Horse Guards, July 18, 1833." society!

Now a Frenchman is employed on the Another ng I wish to notice, is the very very same thing that I have practised and astonishing discussion about “the patent of preached ever since 1816 ! I shall soon Mr. Hall" for condensing the steam escap- publish two other volumes of my memoirs, ing from the working cylinders and safety- when it will be seen what numerous robvalves of sea-going steam-vessels, by passing beries have been perpetrated on my brains, it through a cluster of small copper tubes, both by private and public parties, in miliall surrounded by cold water, so as to return tary and scientific inventions, or suggestions. the fresh water to the boiler, and avoid any Amongst other piratical robberies I have incrustation of salt. Now it so happens suffered, is that of my waterproof percussion that in 1825 I assisted in the construction lock for artillery, the model of which I have and application of similar condensing fasce left at your office, and should have long of copper tubes, at Mr. Gurney's factory in since have demonstrated to you, avd assisted Albany-street, Regent's-park, which were in its exhibition to your scientific readers, applied by Messrs. Busk and Keene to three had not a rare combination of ill health, steam-vessels, which were sent to Bordeaux, and other “untoward" circumstances caused · to navigate the river Garonne, and the ad- delay and desperation. jacent coasts. The fresh water was, and is In 1830, you published in your excellent now, worked over and over again with a very journal my ideas on the identity of electri. small loss, and may be called distilled water city, galvanism, magnetism and solar light;



two years after a man starts up, and strong in patronage and in place, proclaims and gets the credit of “his discovery”! In 1826 I published in your journal my plan of using a combination of coal tar and whale oil with small coal, or cinders for the use of steam ships, as producing more heat in less compass, than common coal or wood. Now, the very government have adopted this fuel, recently “ invented” by somebody else !

Whatever merit or demerit may be due to Captain Ericcson's screw propeller for ateam vessels, I have Admiral Sir Edward Owen's letters to show that I presented the models of the same thing in the year 1828.

In 1824, I presented to the Admiralty my plan of steam ships, shot proof at the bows, and a bulwark 8 feet high, armed with one or two guns to project horizontally 12 inch shells. At 1,000 yards not one shot in a hundred fired from a line-of-battle-ship, would hit the sharp prow of such a steamer, and all that did, would glance off without doing any harm to ship or crew, or pad 'le wheels. But the great broadside of the liner offers a vast and sure mark for the 12 inch shells, and above 20,000 square feet of canvas and tarred ropes, masts, yards, &c., for volleys of fifty of my prehensible naval rockets every minute. Now, they are arming war steamers with large bomb cannon ; but we shall see what they will do against my rockets, which the late Sir Thomas Hardy, Sir W. S. Pechel, M.P., and other naval authorities hive declared, “must put an end to all ships rigged in the present mode."

But it would be endless to enumerate all the labours that have been substantially successful, although fruitless as to profit to, Sir, your obedient servant,

MACERONI. P.S.—The papers of this day (Monday, 25th September) announce that Oxfordstreet is to be paved with wood—so “ long live Maceroni,” as The Monthly Repository sung in 1834, and you in 1825! It will be no go,” after all, without my machine.

face, therefore, converted into a fine surface, instead of exposing one-half only of the boiler to the direct action of heat, as is usually the case. These boilers, as they are to be entirely surrounded by the fire, are to be kept completely full of water, and are not subject, therefore, to burn out. They are to be so set as to form a considerable angle with the horizon, rising from their front towards their back ends about one inch in a foot, by which elevation the steam will be caused to escape readily from the boiler into the steam-chamber or receiver at its upper end."

“The steam-cylinder, with its stuffingbox and piston, has nothing in it peculiar, excepting the construction of the piston, which is made of metal, in one piece, and without packing ; it may be formed of hard cast-iron or of cast-steel, and must be finished perfectly true and smooth. Its diameter is to be such that when its temperature is raised one hundred degrees above that of the cylinder, it will still pass through it readily, but learing no sensible space between the two. When of the same temperature with the cylinder, it will of course pass through it loosely. Up to a diameter of four inches, I think it best to have the piston perfectly solid ; but if above this size, it may be hollow for the purpose of decreasing its weight.

“ Such a piston I bave found to work without any apparent friction, beyond that which necessarily exists in the passing of the piston-rod through the stuffing-box; and the most careful observation leads to the conclusion, that there is not any loss of steam between the piston and the cylinder, and if there is any, it has been practically proved to be so small in quantity as to be more than counterbalanced by the decreased friction, and by the other advantages rosulting from the improved construction of the engine.” The valve is constructed with reference to a peculiar proportion of its parts, which is illustrated by a diagram ; in its general construction it is nearly like some others; its peculiarities we cannot conveniently discuss in the space allotted to our animad. versions. It is calculated to cut off at such part of the stroke as may be required.

To indicate the quantity of water in the boiler, a glass tube is used, as in some other machines, its upper end being connected by a pipe, with the steam chamber, and its lower end with the lower part of the boiler. It is placed at a distance of six feet from the boiler, and from this circumstance, and the arrangement and construction of the tubes, it will always remain cool, whilst it may be so situated as to secure it from the liability to be broken by accident.

“In my improvements, I have had in

RECENT AMERICAN PATENTS. [Selected from the Franklin Journal.] STEAM ENGINES, Nathaniel Bosworth, Philadelphia, July 9.—The patentee says: “My first improvement consists in the manner in which I construct and set the boiler or boilers, and connect them with the pipes for the conveyance of steam, and the auxi. liary parts of the engine. The boilers which I employ are of the cylindrical kind, and they are to be so set that they may be completely surrounded by the flame and heated air from the fire, and have their whole sur

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