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PATENTS LATELY ENROLLED.
Communications of Specifications and Accounts of New Patents, are earnestly
solicited, und will always commund early notice. UR. THOMAS POTT's, (HACKNEY), for a may be made as long again, and the ma.
new Process of Freeing Tarred Rope cbine increased to double the size ; by from Tur, and of rendering it of Use which means about four times that num. to the Munufacturer.
ber of bricks may be produced in about THE process made use of for freeing the same time, and so in proportion to
tarred rope froin tar, may be con- the first mover, the product of the maducted in three different ways : first, by chine will be more or less. The mode : means of sulphate of alumine (cornmon of making tiles is described with preciallum); secondly, by sulphate of alumine sion, and it appears that the operation and fullers-earth; and thirdly, by tullers- in all instances depends upon what is deearth alone. When sulphate of alumine nominated a mouth piece, which is is used, the rope is to be cut into proper screwed to the box by a flanch, having lengths and opened, and boiled in water, in it suitable openings or orifices therein. in which is mixed five pounds of sulphate Thus there are different mouth-pieces of alumine, to every cwt. of rope. When for making mouldings to ornament build. boiled an hour it is to be taken out and ings, and channels to convey water; and beaten, and ihe operation repeated. it is plain that whatever shape the hole The rope is next to be boiled with a car- is made into, the same furma will be ob. bonate of lime, wbiting is toe most pro- tained by the clay pressed throngh it,
It is then to be cleaned and which is received on bandages over rolbleached either on the grass or with oxylers, to the length required, aird then muriatic acid. The operations are some. cut off even at each end by the separator. what similar when fullers-earth is used, Tubes and pipes are made in round or or fullers.earth with alum; but the pro- square boxes, or receptacles of wood or portions of the materiais differ; for an cast iron. The piston should fit nearly account of which the reader is referred tight, and be supported, or side-steadied, to the specification,
when lified above the round or square
box or receptacle, in order that it may MP.JOHANN GEORGE DEYERLEIN'S,(LONG be filled. Tubes of all kinds and deo
ACRF), for « Machine, new Principle, scriptions, whatever be their shape, may
The inachine consists of a box or other MR. PETER STUART's, (TLEET-STREET),
the tints, lines, or figures, alluded to, as smooth as possible, as in copper-plate white instead of black; so that where engravings, ought to be made sufficiently in the common way the paper is covered rough, either by mechanical or chemical with black or coloured ink, the new me- means, so as to make the ink, applied by thod is to leave it uncovered, and rice the letter-press printer's balls, adhere in versa : or instead of producing dark a way nearly equal, or in such quantity figures on a light ground, to produce or proportion as is wanted or intended. light figures on a dark ground or surface, The last preparatory process of the plate or on a ground darker at least than the for the letter-press, previously to its being figures themselves. In the second place, printed as described, is by fixing it on a instead of representing all figures by wooden block; or by grooving it on a black tints or lines, or black figures, as brass or other metallic standard; or by now commonly represented on a white fixing it on a clay or earthen substance ground or surface. Mr. S. can adopt or cement; taking care that the whole any other coloured ground or surface, body thus formed shall not be higher or taking care always to produce the advan. lower than the types commonly used at tageous combinations of the two arts of the letter-press; and also taking care, engraving and letter-press printing, that that it be calculated in every degree to is to say, the dispatch and economy of be embodied as it were with the lettere the latter with the effect and general press printer's form or types, so as to utility of the former, “ a combination," produce, by the very same operation of says he, “ hitherto wislied for in vain, the letter-press, the impression of both and from which, it may be obvious, very the plate and the types at one and the essential results will arise both to the same time, or by one and the same pull artists and to traders in the arts, and, in of the letter-press printer, and on the fact, to the public, that will no doubt very same sheet or piece of paper. Or be actuated by interest to encourage a the plate or plates thus prepared, may, view invention, which may aiford an ex- if on particular occasions deemed more traordinary gratification by a specdier expedient, be worked off alone at the mode of intelligence, through a cheaper letter-press, so as to produce the inmedium."
tended effect of engraving with the faciThe engravings of the figures may be lity and dispatch of multiplying copies cut or stainped on plates of brass, cop- agreeally to the nature or principle of per, tin, pewter, type-metal, or wood, operation peculiar to ihe letter-press. or any other substance on which engrav- “Thus by the means now described or ings can be made; and, for the better specified," says Mr. Stuart, “ I combine, adapting the ground or surface of the or unite, for maps, charts, music, anatoplate, or for the better rendering the mical figures, or any figures or repre. ground or surface fit in all its parts for sentations of the human body, or for all the proper reception and adhesion of or any of the other figures already mens that kind of ink used by letter-press tioned, performed in my manner, printers, so as to produce a clear and parate arts of the copper-plate engraver an equal impression on all its parts at and the letter-press printer, by engraving once, he causes dots or lines to be cut, as engravers usually do, and by printing marked, or stamped, or drawn across the as printers usually do; thereby renderground or surface of the metallic plates, ing, by the application of these united or other substance; or corrodes it witli arts in tbe printing of books, magazines, aquafortis, so as to produce a sufficient pewspapers, periodical publications which degree of roughness for the adhesion of require dispatch, a very great saving or the particular ink now mentioned; abridgment of time, labour, and expence, leaving the figures or subject of the plate in the exercise of both aris, and conse. or engraving, untouched by such dots or quently a very great convenience and lines. The part of the surface which is advantage to the public at large." not engraved upon, instead of being made
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Parliament, upon the Bills for abolishing the TREATISE on Rural Affairs, illustrated Punishment of Death for Stealing to the
with various places of Husbandry imple- Amount of Forty Shillings in a Dwelling. ments. By Robert Brown, farmer at Mar. House ; for Stealing to the amount of rive kle. 2 vols. 8vo. 11, 5s.
Shillings privately in a Shop folid for Stealing ARTS, TINE.
on Navigable Rivers,
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Basil Montagu, esq. 58.
Communications relative to the Datura
Stramonium, or Thorn Apple; as a relief or
Addressed to the editor of five acts. By Mr. Holman, 2s. 6d. The Dramatic Works of Ben Jonson and before published. With a coloured engraving
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A Cockney's Adventures during a ramble HISTORY
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VOYAGES AND TRAVELS.
ROYAL INSTITUTION. parted with some of its
EW discoveries in modern times quired a portion of water, it ba poun
have so powerfully excited the ato properties of potass. Aminonia ha reas tention of the scientific world, as that of been procured as a metallic armies the metallic nature of potass, soda, and united with mercury, or sodium. The amumonia; though this discovery has not manner of procuring it is, hy placing a bitherto been atterided with any benefi- globule of mercury in a small cavity, cial practical application. It can bow- made in a piece of muriat of ainincuia, ever scarcely be doubted, that a more (sal ammonia) one wire from a collaié perfect acquaintance with the nature of battery is connected with the mercury, metallic bodies, must be followed by in- the other with the muriat of aminonia: proved processes in the inodes of smelt- the globe of mercury is increased in size, ing the pres, and in the various arts of loses its fluidity, and becomes a solid memetallurgy. Potassium, or the metal of tallic amalgamn. potass, bas lately been procured in larger The discovery of the metallic nature of quantities, by heating iron fileings and the alkalics, potass, and ammuia, has potass together in a gun barrel, or iron been followed by the discover, that all retort coated with clay. The colour of the earths are also metals united with potassium resembles that of tin, it is ea. oxygen. These earths are "silex, clay, sily cut with a knife, and solders with it. lime, magnesia, barytes, strontian, and self at the common temperature of the the newly discovered earths, zucon, uria, átmosphere. Its most remarkable quali- and glucine. ties are its levity and combustibility. It Lavoisier in his elements states his is considerably lighter than water; if the opinion that barytes, and some if not all weight of a given quantity of water were the earths were metallic oxyds, but this 10 oz. that of the same quantity of pot- opinion was not supported by any proof; assium would be only 1 oz. it is the and the experiments of Toudi, who aslightest known solid substance. When it serted that he had procured globes of comes in contact with water, it iinme- metal froin barytes, lime, and inagnesia, diately inflames with great violence, de have generally been regarded as incon. composing the water and absorbing its clusive, but perhaps they have not been oxygen. It will burn with intense heat properly investigated. * By means of the and vivid light under the surface of wa- Voltaic battery, Dr. Davy procured very ter, and will probably be found the most small globules of metal from all the powerful agent in destructive naval war- earths, but they explode almost iinme. fare, that has ever been employed. The diately afier their formation, and absorb properties of sodium are nearly similar to oxygon from the water, which is used to those of potassium; except that when make the earths into a paste to be acted pure it does not infiame with water, but upon by the Voltaic battery in these exinoves in a rapid manner along its sur- periments. Potassium, or the metal from face, decomposing it, and absorbing the potass, has the strongest affinity for oxyoxygen. Potass, or the vegetable alkali, gen of all known substances; when it is in the purest state in which it is obtained combined with the earths, and acted by chemical means, retains 17 per cwt. upon by the Voltaic baitery, a larger of water, even after being kept in a red globe of metal may be obtained froin heat for several hours; it is properly an then. The attempt to decompose the hydralt of potass. When potassium is earths by ignition with iron and charcoal Lurned in oxygen gas, it forms a sulistance containing more oxygen than pot- * Vide Mr. Kere's nose in the 3d edition ass, and is free from water; it is hard of his Translation of Lavoisier's Elements, P. aud most iufusible; but when it has 29%.