270 PERPETUAL MOTION ON PHILOSOPHICAL PRINCIPLES. brush, which most gun-makers send half, when this moyes one of twenty, either with the ramrod or washrod, and is wound up only once in two will answer the purpose tolerably years. In twenty-four hours the well. By using it constantly, the maintaining weight of the common gun will be prevented leading at all. clock descends six inches; in this it But it must be observed, that, pre- descends only 1-10th of an inch. vious to the use of the brush,

the The least weight which we at pretouchhole should be closed, and the sent 'recollect to have heard of being barrel filled with boiling water, used by the first artist of London is which softens the adhesive powder, five or six pounds, where this reand partially assists in cementing quires only one, in consequence of the lead to the barrel. The barrel the diminution of friction. So far it should afterwards he washed in cold has been thought necessary to dewater, for the steam from hot enters scribe this clock in comparison with the pores of the iron, and will not, the common one.! from its confined situation, evapo- “We now come to that part to which rate for some time.

extraordinary merit is to be ascribed "Hammer" will find a proof of the faculty of winding itself up the comparative merits of the Flint without the intervention of human and Percussion Guns in the same power. This faculty is derived from page with his communication. the weight of the atmosphere, and I am, &c. &c.

can never cease (under the conditions W.E. WIGTHMAN. after mentioned) while the machine Malton, July 4, 1825.

lasts, and while a column of air either loses or gains 1-150th part of space momom uveight five times in the

the clock goes without requiring from a foreign work : should you of the air, five times in the space of SIR, --The following is copied any

assistance ; or, in other words,

as long as the change of the weight consider it worthy publication, it is two years, shall be such as to cause much at your service, R. W. DICKINSON.

the mercury either to ascend or fall

2-10ths of an inch in the barometer Albany Road,

above or below its mean

height. “The power is at present applied The wearing out of wheels, or of to the machinery of a clock; this any kind of machinery by friction, clock, unconnected with the power, never can be avoided accordingly, is calculated to go for two years it has never been required in the diswithout winding up, by the weight covery of a perpetual motion. It is of a single pound, that gives motion therefore sufficient, on that subject, to a pendulum of twenty pounds, to say, that the present machine, which moves through a space of 518.400 inches in 24 hours, while tion with that of the common clock,

upon a fair comparison of its fricthe small maintaining weight (a would probably move five centuries, single pound) descends only 1-10th a period sufficient for any purpose of an inch. The internal work of that can be required.” the clock consists of three wheels. In order that the superiority of this movement may be obvious to every understanding, as well as to those THE MARINE CRAVAT AND SCHEF. more conversant with the more dif

FER'S LIFE-PRESERVER, ficult parts of mechanics, it is ne- Sir, It is not my intention to cessary to mention, that the common 'enter into any discussion with me eight-day clock requires a weight chanics as to the respective merits of fourteen pounds, where this only of the “ Marine Cravat” and the requirs a weight of one, is wound “ Life- Preserver," as it is evident up once in eight days, and moves a they are only different methods of pendulum of three pounds and a applying the same principles.

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271 I am certainly, of opinion, that form; tie this round your neck, and Mr. Scheffer's plan of inflating his you will be able to keep yourself at machine with air instead of employ- the surface of the water with the ing cork, is decidedly superior, not slightest exertion, as I can vouch only on account of the greater ifrom experience. But a better and buoyancy obtained, but from its genteeler application of this conbeing thereby rendered more por- trivance is to provide yourself with table, as it can, when wanted, be in- two such annular floats as I have iated for use in the twinkling of an just described, into which introduce eye. For the information of me- your arms up to the shoulders, and chanics, I will, with your permis- connect them together by a string usion, describe a simple method of behind. With the assistance of these

constructing a' Marine Cravat," “ Marine Epaulets ". mechanics not only much cheaper, but equally might, with the famous Benjamin efficacious with that of Mr. J. H. Franklin, take a nap upon the water Bell. o Procure at any butcher's a in the most perfect security. bullock's weasand for 4d., which in

I am, Sir, flate with air si then with a piece of

Your well-wisher, sail-twine divide it into four or five

T. BELL. compartments, like a string of sau- 2, Commercial-row, Whitechapel, bsages, to enable it to take a circular

July 19, 1825. anodihnou diguhe'{': 4.14, guidoso gilt oliv tis to runs to 11 METHOD OF BANDING SPINDLES UPON AN OLD, BUT 980 ni S doidvi 9 9.13 101

ALMOST FORGOTTEN PRINCIPLE. imp97 studen? JUN elow 1980 og 32 sien

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D) byrouth -sir, elithilips| ei: Ditoret 199idsja SA

O 29aid L 01 ei to mtools doul 1) *** Place a pulley at one end of the together, it would, perhaps, be advi. frame betwixt the roller and the spin- sable not to exceeď twenty. dles, then pass the band through the pulley and round the spindle, from

Description. whence it must be passed on to the roller, from thence to the spindle,

A, the spindles. and so on in suco

BB, the pulleys, fixed at each end of to the other end of the frame, where the frame. o another pulley must be fixed, and through which the band must be passed CC, the roller.

and carried betwixt the roller and the D, a pulley to support the band, the Spindles to the first pulley, where the band going under the roller. ends of the band are to be joined togeJither e I

SAMUEL SMITH, N. B. Although, by this method, Smedley, near Manchester, any number of spindles may be banded:

July, 1825.





quetry, and other fire-arms. CommyA new Fire-engine has been in- nicated to him by a certain foreigner vented at Berne, by a mechanic residing abroad. --Dated April 23, 1825. named Schenk, which possesses much

Thomas Alexander Roberts, of Mongreater facility than any former ford-place, Kennington-green, gentlemachine of the same description. man; for a inethod

of preserving potaIts force is said to be so extraordi- Dated April 23, 1825.

toes and certain other vegetables. nary, that the column of water which it sends out will, at the distance of

Samuel Ryder, of No. 40, Gower100 feet, easily break up the pave

place, Euston-square, coachmaker;

for ment of the street, untile the houses, ing the pole to the carriage by a new

an improvement in carriages, by affixand demolish their masonry up to invented apparatus.-Dated April 28, the second floor,


Daniel Dunn, of King's-row, Pen

tonville, manufacturer of essence of MACHINE FOR UPROOTING TREES. coffee and spices; for an improved apA Toronto farmer says, in a letter separating the infusion of tea or coffee

paratus for the purpose of beneficially to an American Paper, that he had from its grounds or dregs. Dated “just seen a Machine for pulling up April 30, 1825, the Stumps of Trees, invented by a

James Fox, of Plymouth, rectifying Mr. Harris, an ingenious mechanic, distiller; for an improved safe to be which is extremely powerful, multi- used in the distillation of ardent spirits. plying the force applied to it 700 or -Dated May 14, 1825. 800 times, which also can be increased or diminished as occasion may require. It is capable of pulling out the largest stumps, and can he moved from place to place by a

TO CORRESPONDENTS. single yoke of oxen ; it is, withal, very simple, and may he worked

JfJ. B. C. D. has really niade the disby either men or horses. The machine will, when delivered 'and may obtain both profit and honour by it.

covery hé speaks of, there is no doubt he erected, cost about 25 dollars."

We would recommend him to apply to the Commissioners of Weights and Mea


Anti-Hippopotamus would be much Take a straw-rope, such as is used obliged to Mr. Thomas H. Bell, if he in some counties for thatching, and would inform him how to mount his stretch it across the field from about Water-horse without capsizing it? the middle towards the fences, sup- Communications received from-Felix ported by stakes fixed in the ground, -D. D. É.-Plane-J. Walker-Taperto raise it a few feet. This is a suf- P. Smith-Dick Forge-Samuel Smithficient notice to the rooks to keep Ikey Pringle-Timotheus-RW.D.

off. If fields are large, other ropes A. R. F. - A Reader in the Potteries A , may be placed at a proper distance; Seaman.

for if food grows scarce, they may, after cautiously reconnoitering for some time, approach to within 200 or 300 yards of the supposed trap.

Advertisements for the Covers of our Monthly Parts must be sent in to our Publishers before the 20th day of each Month.


Communications (post paid) to be addressed to

the Editor, at the Publishers’, KNIGHT and Augustin Louis Hunout, of Brewer- LACEY, 55, Paternoster-row, London. street, Golden-square, gentleman; for Printed by Mills, Jowett, and Mills (late certain improvements in årtillery, mus Bensley), Bolt-court, Fleet-strert

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valuable Magazine

The boiler, AA, being close, and appears to be open to experimen. having no communication with the attalists

, as well as to practical men, I mosphere, but through its pipe, CC, 1 trust you will find the following com

first opened my air-tight cock, 90,

then made a few strokes with the bel. munication worthy your notice. I lows, G. The moment hot air came out found, by repeated experiments, that of its valve, I stopped the air-tight after filling a (wine) bottle with boil- cocks, then let in a little water from ing water, and then turning it bot- the funnel, E, and the water rushed up tom up, the air that passed into the instantly through the tube, fl; and bottle as the water ran off, became filled the nine-gallon cask about onerarefied to double its bulk or volume; half. To let the water off, I opened for immersing the bottle neck down the cock in the pipe H, and it all ran wards in cold water, it became half off through F. I made sunne strokes full of water in a short time. I then very rapidly after the pipe, II, became

full. I have given you the experiment pursued the experiment in the man- as I made it, but it now appears to me ner described in the prefixed draw that the bellows had better blow into ing, and found the result similar to CC; then both the air-tight cocks might that in the bottle.

be removed, and a much simpler mode

substituted in lieu of them. Si Description of the Drawing.

I am, Sir,

Your obedient servant, 1 set AA, a tin boiler, about twelve inches deep, closed at the top, containing two or three gallons of water kept boiling by the fire in pan BB.

The writer adds, in another commu, CC, a tin pipe, one inch and a half nication to us~"I believe this expes hore, soldered into the top of AA, and

riment to be original. It succeeded passing down about seven inches' into beyond my most sanguine expectation, the boiling water. At the bottom of CC the work not being of the best kind, are several small tubes, intended to

and my' workmán a carpenter's apmake the passing air spread through prentice. Its simplicity is obvious for the boiling water.

raising water, because any quantity

of atmospheric air may be rarefied and DD, a nine-gallon beer cask, having condensed by keeping about ten gallons two strong additional heads, and the of water boiling: the steam-engine upper original head perforated with requires a boiler proportionate to the holes to let the condensing water spread power produced.” like a shower bath; the whole cask made air-tight by pasting paper twice over it. E, a small funnel, with a water-tight

ELASTIC GUM, plug on the top of DD.

SIR,-Your Correspondent, Me F, an inverted syphon, kept full of chanicus," seems not to be aware, water, which covers a water-tight plug that the title, “ Elastic Gum,”, is or valve.

emphatically applied to Gum Caout G, a pair of bellows, with a valve chouc, or India Rubher; but, as he opening upwards ; connected below is

may not know how to obtain it in a a copper pipe, one inch and a half bore, fluid state, it will, perhaps, be ac, passing into the lower part of DD:. ceptable to state the method he must There is an air-tight cock added to this pipe at Q, and another on the pipe HH pursue. (connected with the tin boiler, AA),

Put a small quantity of caoutchouc, which passes into the upper part of sliced very small, into a three or four DD,

ounce bottle, and nearly fill the bota The copper tube, II, conveyed the tle with spirits of turpentine; place raised water into DD, near the top, in

the whole in a large saucepan con. order to complete the condensation; taining water ; keep the water boilI then began by letting a little water in ing, and often shake up the ingrefrom the funnel, E, above, still keeping dients. When the turpentine seems its plug under water. Then followed the to be saturated, strain the fluid


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