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DIVING FISHERMEN. for the expansion of these corks in the my laurels, and with my poor device mạnner described by Mr. Bell would, in my hand, am I to be hurled, “at it appeared to me, not in the least in one fell swoop," from “the battlecrease their buoyancy, unless their ments of the superstructure" on which bulk could also be increased at the I “had plauteid my fondest hopes," same time.

and of the unfortunate Montis there is As to the last plan alluded to by the to be left not even so much as “ a same gentleman, it seems probable to wreck behind;" whilst the bell upon me that a diagram I made some time the battlements—“the mighty Tom" since may not be dissimilar to it; but " who sounds so woundy great," I will not attempt to anticipate his rings, in derision, the knell of all my method. Should mine appear to pos- hopes to immortality. sess an advantage over his, I will, with But, Sir, to the object for wbich I pleasure, send it for insertion (that take the liberty of addressing you.having been my original intention), Really I am not disposed to concede together with another method I have to Mr. Bell (who is as unknown to me since thought of, and which is chiefly as I am to him) even the merit of constructed on a well-known principle having devised the best of two plans, of hydrostaties.

both of which are good for nothing, I remain, Sir,

In the first place, the design I have Your very obedient servant, given could be made to act for a time;

G + R. the machine of the “ better plan," I,

with equal confidence, assert would SIR. That the little device on the never stir of itself at all. If this is subject of Perpetual Motion, which true (and which, I dare say, your well.

on did me the favour to insert in informed Correspondent will have the your 106th Number, should have been

fairness to acknowledge he believes deemed by your Correspondent, under

would be the fact), the better” must the name of T. Bell, as entitling me

be considered the worst plan of the to be considered “a young man of

two. The defect in mine, I think it very promising abilities," must cer

will be allowed, is a little observed; tainly be matter of great self-gratu

but the amazing resistance from friclation to me, and ought to be properly

tion necessary to draw a sort of contiappreciated accordingly; and as he

tinued piston through the hole in the stretches out his fatherly hand, and

buttom of the box, joined to the pressmooths down the hair upon my fore

sure of the superincumbent and surhead, it is only becoming me to hold

rounding water, as well as the friction down my head, and to find my youth

of the pulley, never leave us for a ful face appropriately suffused with the

moment able to suppose such a conmingled blush of modesty and pride.

trivance could act at all. I bave But, Sir, old birds are not to be caught

thought of the same thing as that with chaff; and when next your Cor

described by Mr. Bell before I read his respondent honours me with his enco

account, but I should have never miums, I hope he will, for the sake of thought of mentioving to any one a my “self-complacency” and his own

conception, in my humble opiniou, appearance of candour, make the

and, which it “ strikes me very formotive (which is so obvious in this in- cibly to be, completely preposterous. stauce) a little less apparent: for, Sir. As I have not intended really to offend no sooner has he finished the above in any way your well-informed Coreulogium, than he, the said T. Bell, respondent, I hope to hear from him " is forcibly struck (the terms in which that I have not accidentally done so. he announces to us the design to be although I must still contend that my his own invention) that there is a

little device is as good, at least, as his better plan of applying this principle great one. than the one described by Philo Mon

. I am, Sir, tis.” He then gives you a description

. Your obedient servant, of “ an endless chain, a pulley, cocks,

Philo Montis, springs, and a hole in the bottom of a September 27th, 1825. bux;" by which apparatus, when put together, my poor, little, simple device is to be completely superseded, and

'DIVING FISHERMEN. taken entirely off its legs (one of which, to be sure, is rather dropsical, There is a mode of catching fish and the other not a little crooked). peculiar to the Gulf of Petrasso. Thus, “ as if by magic,”. deprived of. The fisherman being provided with

INSTRUCTION FOR MECHANICS AT PARIS.

431 a rope, made of a species of long freezing point of mercury, if the exa grass, and which floats near the sur periments were made at a tempera. face, has only to move his canoe iure a little under 32o. where he perceives there is a rocky bottom; this done, he throws the rope out, so as to form a tolerably large circle; and such is the timid nature of the fish, that, instead of

VELOCITIES OF STEAM-BOATS, rushing out, it never attempts to We extract the following Table pass this imaginary barrier, which from a valuable paper on Steamacts as a talisman, but instantly de- boats, by Mr. Tredgold, in the last scends, and endeavours to conceal Number of Professor Jamieson's itself under the rocks. Having Edinburgh Philosophical Journal. waited a few moments till the charm The immense increase of power has taken effect, the fisherman which appears to be necessary to plunges downwards, and not unfre- obtain a small increase of velocity is quently returns with four or five fish, very remarkable, and must have a weighing from two to six pounds great influence in inducing a preeach. As they seldom find more ference of engines of a moderate than the heads concealed, there is size. The calculation applies to the less difficulty in bringing forth still water. their rich prizes; and when the Miles per hour.

Horses' power, harvest is good, the divers are so

3.............. dexterous, that they have a method of securing three or four fish under each arm, beside what they can take in their hands. The fish greatly re-, sembles the John Dory.

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REFRIGERATING SALT.

0.................... 200 If we mix 57 parts of muriate of potash with 32 of muriate of ammonia, and 10 of nitrate of potash, INSTRUCTION FOR MECHANICS a refrigerating salt will be produced.

AT PARIS. This salt, put into four parts of The celebrated Baron Charles water, and quickly agitated, will

Dupin, of the Institute, has undermake the thermometer descend from taken to vive instructions to the in. 20° to 5° below Zero in Reaumur's dustrious classes in geometry and in thermometer,

mechanics, as applied to the arts. His instruction extends to the great

manufactures, as well as to the most ce ; WUDUCED BY THE COMBINA- ordinary and common arts of life, TION OF METALS.

and even to the fine arts. The According to M. Dubereiner, the architect, the carpenter, the mason, fusible metal consists of one atom of the sculptor, the painter, and the lead, one of tin, and two of bisinuth; engraver, each require a knowledge and it becomes fluid when exposed to of certain geometrical or mechanical a heat of 210". If the fusible metal, principles : M. Dupin supplies them formed of 118 grains of filings of tin, with ihis knowledge. The know207 grains of filings of lead, and 286 ledge he teaches is necessary to all grains of pulverised bismuth, be in- mechanics, and artists who have any corporated in a dish of calendered thing to do with mechanics. In soine paper, with 1616 grains of mercury, cities of France some learned Prothe temperature will instantly sink fessors have hastened to follow M. from 650 to 140. M. Dobereiner Dupin's example, and others. prothinks that it might sink so low as the pose to follow it. French Puper.

432

. CORRESPONDENCE, ETC. METHOD OF PREVENTING of gum mastic, and half a pint of OIL AND GAS LAMP GLASSES FROM turpentine varnish (which may be BURSTING,

got for less expense at the colourThe glass chimneys which are now

shops than it can be made for, exin such general use, not only for oil cept in large quantities); put the lamps, but also for the burners of above in a tin can, keep it in a very oil and coal gas, very frequently

warm place, frequently shaking it, burst, owing sometimes to knots

until dissolved; strain it, and keep in the glass, when it is imperfectly

it for use. Should you find it harder annealed, but more frequently to an

than you wish, you may add a little inequality of thickness at the lower more turpentine varnish. end, which prevents the glass from

HENRY Hopt. expanding uniformly when heated. M. Cadet de Vaux informs us that, when the evil arises from the latter

NOTICES. cause, it may be cured by making a

TO cut with a diamond in the bottom of the tube. He states, that in an es

CORRESPONDENTS. tablishment where six lamps are lighted every day, and where this precaution was taken, there was not “ A Real Friend," and “ the circle" a single glass broken for nine years of friends he represents, seem to mis

understand entirely the principle on

which our publication is conducted. ANSWERS TO INQUIRIES. Were we to admit nothing but what is

unquestionably correct and good,” the No. 147.-COLOURING BRICKS.

Mechanics' Magazine would be conSir, I send you the following

verted into a mere repository of wellreceipt for colouring Tiles:

known doctrines and precepts, instead Take one ounce of red lead to of continuing, as it has heretofore done three ounces of manganese; get some with so much approbation, to be the strong clay, mix it with clean water vehicle of every thing in the shape of until it is as thick as cream ; pass it through a very fine sieve, then mix

original and ingenious speculation. it with the lead and manganese. Let Communications received from-Exyour tiles be dry; then pour it over perimentum-Crucis-A Mechanic-M. them, and set them to dry. Do not let them touch each other in the set

Welch-J. C. E.-W. S.-W. B.-Mr. ting, and keep them free from dust Thomas-F.J-I--n-Jack Long-T.S. as much as possible in the kiln. I -A. B.-J. 0.-W. C.- B. !. C.-Sahave only made one trial of this me- moht-G. S. thod, but it answered very well. To inake your bricks and tiles of one colour, mix all the different sorts of clay well together.

*** Advertisements for the Covers of I am, Sir,

the Monthly Parts must be sent to Yours respectfully,

the Publishers before the 2014 day of FRANK Button, Colston,

each Month. Brickmaker. Near Nottingham.

No. 137.-VIOLIN VARNISI. Take half a gallon of rectified spirits of wine, to which put six ounces

Communications (post paid) to be addressed to

the Editor, at the Publishers', KNIGHT and LACEY, 55, Paternoster-row, London, Printed by Mills, JOWETT, and Mills flate

Bensley,) Bolt-court, Fleet-street.

Mechanics' Magazine, MUSEUM, REGISTER, JOURNAL, AND GAZETTE.

No. 112.)

SATURDAY, OCTOBER 15, 1825.

[Price 3d.

NE W PATENT STEA M-COACH, INVENTED BY MESSRS. TIMOTHY BURSTALL AND JOHN HILL, ENGINEERS.

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BURSTALL AND HILL'S NEW PATENT STEAM-COACH,

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