Gas Retorts-John Suarbrick, of Blackburn, Eng. , Patentee,—The inventor takes clay as dug uom the pit, and i£ it contains coal or other refuse, burns it until the coal is reduced to ashes; or if no eool exists in the clay, then he mixes the asbes with it, or other varieties of day, until a suitable material for his purpose is obtained. He then grinds this with just such a quantity of water as will produce a stiff doughy mass. Having taken a mould of the size required (and which .h i:i\i be made in sections) and placed it in an upright position, he introduces a core-bar into it, Filuid j it firmly into the centre. The stiff' day is then rammed into the spaces between the mould and core, the wedges are withdrawn, and their spaces tiled up with clay, The core-ba.r is then raised by a lever, and another section of the mould united to the first, the same operation being again repeated until i.iii- retort is fully moulded. The retort thus moulded is dry enough to be taken at on ce to the oven and baked. Retorts made Qf Stourbridge day are much superior to those made of iron, for making gas. Combing Wool,—8. C. Lister, of Manmiig- ham, England, patentee.—The giU-fallers are simply made of much narrower dimensions than usual—about from one-fourth to one- eighth of an inch, Smali portions ol the material can be operated upon ;i 1: once, and less oil, it is stated, is required. He also combs cotton en line combs. Machine for Detekmining a Ship's Lom” GI'IUDE:—John Moore, ufArtbur's Towii,Wex- ford , 1rel and, patentee.—This ins trument; cor sists of two graduated brass circles intersecting .each other, and a turd, circ 1e equatoriat to these two, The position of these circles is capable of being adjusted with reference to each other, and they -are used in combination with a fourth circle, also graduated, which Hums a grea'; circle to the see ' 1 i globe composed of the intersecting circles mention-. ed. The Hlodes of using these circles vary with the nature of the particuJ ar position requiring to be solved, Substitutes foii Suspenders, &c. in Clothes.—J, Saillant, of Paris, tailor, patentee. He inserts into certain parts of articles of dress, such as pantaloons, vests; coats, &c. _ stri ps of india rubber, by which a good lit of the garments is secured and they thus are retained in their proper positions Wjthout the aid of straps, &.;. Refining Gold and Precious Mktals.— A. Parks, chemist, of Pembrey, Wales.—For separating gold, which is mixed with auriferous earth, it is first smeited with lead and the usual tluxes, and the compound thus resulting is melted, with the addition of one per cent. zinc t) every ton, which contamS ten ounces of gold, The zinc is added when the compound is in a me ed state, and at about the temperature of molten zinc, After stirring'so as to insure all the gold being taken up, the mixture is allowed to cool, and the zinc and gold are found in combination. The gold is separated from the z inc by an acid, Vacuum Sugar Pans,—J. Walker, ofWoI- verhampton, Eng., patentee.—The improvement consists in introducing into the body of the vacuum pan a series of vertical tubes, through which steam is admitted to facilitate the operations of evaporation and crystallization. The tubes are enclosed within a cylindrical cas¥Jg between the sides of the pan, a vacant space is left. This arrangement causes an upward current of the solution in the pan, at the centre of the series of tubes, whilst a gentle descending current is produced bet ween the cylinder and pan, by w hich com- po und motion the contents in the pan are prevented from burning. CoA'riNtf the Inside of Tubes—John J, Russell, of Wednesburg, England, patentee.— This improvement simpI y consists in coa ting the inside of iron tubes with successive coatings of gutta percha in a state of solution. The coating is laid on with a b rus h or by pouring in the solution.— [Condensed from the “ London Mechanics' Journal,” “ Expositor,"/