XE. JOHN BRIERLEY'S (GREENFIELD, FLINTSHIRE,) for a new Mode of setting Blue Lead for corroding the same into White Lead. TU IIS method, by means of a bed of dung or hark, into which are inserted pots filled with acid; over these are placed boards having holes bored in them to admit the vapour of the acid round the rolls of lead. On these another bed of dung or bark is placed, and the process repeated before, forms a second bed; these beds may be repeated to any practicable extent, and are denominated a stack. There is a chimney or flue running through all the beds, for the purpose of distributing the vapour of the acid equally through them all, for which purpose that part of the flue, which extends from the one bed of dung or bark to the other, is left with small interstices between the bricks, so as to cominunicate any superfluous vapours above or below, or carry off to the other bed any vapour which may be to spare in that bed. The observations of the patentee refer 1. To the number of pots, and the difference as to the expense of them. . To the health of the manufacturers.3. To expenses of the annual breakage. With respect to the 1st.-According to the above plan, a bed may be set with 280 pots of equal effect with a bed, which, according to the old mode, would require 560 pots, making a difference of one half. The pots used in the plan cost 2d. each; those in the old method 5d. each. So that 280 pots at 2d. each will cost 21. 6s. 8d. and 560 pots at 5d. will cost 111. 13s. 4d. leaving a difference in favour of the plan of 9. 6s. 8d. for each bed. Now if a stack consists of seven beds, and the manufacturer raises nine stacks, the gross amount of the saving, in the first instance, will be 5881. According to this plan the manufacturer can set three tons of lead in a bed, when in the old way he can only set about 1 ton 12 E. P. cwt. ; and the corrosion is more certain, from the fumes of the acid having free access to all the lead, which is placed upon the boards, instead of the rolls being confined separately in the pots along with the acid; that the pots, which are placed under the joints of the stackboards, will be filled with liquor or acid neutralized by being mixed with the ooze in the bark, and the fumes arising therefrom being condensed, the pots become filled, and the necessary corrosion is therefore prevented. From this mode of setting lead, the manufacturer will obtain a third more of white lead than according to the old way. 2dly. The plan clearly demonstrates, that the rolls of lead being placed upon boards are easily taken off when corroded. When the stack-boards are removed, the rolls should be well sprinkled with a watering-can, which will prevent the dust from rising and annoying the labourers. Now, according to the old way, if the lead is well corroded, the expansion becomes so great as to fill the pots tight and close, and the labourer, in order to disengage the ceruse from the pot, is obliged to knock it upon the taking-off boxes, which causes a dangerous dust to arise, that affects the labourer with that most dreadful disorder, the colic of minerals, 3dly. The breakage of the pots, aecording to this plan, is not as 1 pot to 30 in comparison of the breakage arising from the mode of setting. For experience tells us, that in the old way, we may expect a loss of 30 pots in 560, and of course in a stack 210 pots, and in 9 stacks 1890 pots. Supposing the manufacturer to take up and set four rounds of stacks in one year, the number of pots broken will be 7560, which, at 5d. each pot, amounts to 1571. 10s. These nine stacks of pots in the old way would cost 7351.; according to the new plan only 1471. leaving a difference of 5031. as stated under the 1st head of observations. Exclusive Exclusive of the savings before enumerated, it must be of very great benefit to the manufacturer, that he can bring into the market, in the same given time, a third more of white lead by pursuing the plan before specified, than by the old modes. MR. ABRAHAM SEWARD'S (LANCASTER) for a new or improved Hook, for bearing up the Heads of Horses in drawing Carriages. This invention consists in spring or springs, being so fixed to what is usually called the watering-hook of a saddle, as to communicate, by means of the bearing rein, a certain freedom of action to the motion of the horse's head in travel ling. These hooks may be constructed in various ways, but the patentee recoin mends a round plate of brass, or other metal, to be fastened to the pummel of the saddle; through the centre is passed a pin, on which the hook is fixed, so as to move backwards and forwards on the centre. Just below the shoulder of the hook is rivetted a circular wire, having a worm-spring, and to the plate, on the other side of the hook, and at a short distance from it, is fixed a ring, or flat piece of metal, having a hole through it sufficiently large to admit the circular wire, but not so large as to suffer the spring to pass through it; by this means that end of the spring is prevented from moving during the motion of the hook and circular wire, and, the other end reacting against the hook, has a constant tendency to keep it in its usual situation, and consequently resists, in some degree, any force tending to draw the hook round the centre: hence it may readily be conceived, that, by means of the spring, the bearing rein is constantly drawn back with a certain degree of force, at the same time allowing it a proper motion or play, Thus a freedom is given to the motion of the horse's head, similar to that which is given by the hand of a rider. MR. T. and J. CLATSWORTHY (WINSFORD), for Shears on an Improved Construction for shearing Sheep, &c. The principle of this invention is in the bow of the shears, which is inade double. The bow, before it is turned, is about nine or ten inches long, which is turned double in the middle; it is then brought straight, leaving a snout, about an inch long in the middle of the bow. When the bow is turned into shape, the hinder part of the bow must be held in a vice, and the snout twisted; and if the bow should be weak, or injured in turning, small rivet may be put in the front. MR. NICHOLAS FAIRLESS(SOUTH SHIELDS), for a Windlass, Windlass Bills, and Metallic Lese-hole Chamber, by which manual Labour and Time are sured in heaving to, and getting on board Skips Anchors. The bitt-heads are hollow, containing the wheels wrought by the cranks or handles, which give motion to the windlass body. The surge-boxes are of cast iron, having such an angle, that when a rope is applied round the ends of the windlass to raise a weight, the rope slips down, or is forced by the adjoining part of the said rope into its original situation, and is thereby prevented, from what the seamen call riding, that is, the one part crossing the other, which always produces inuch delay and inconvenience. The windlass body turns on an iron axis, the ends of which are turned to fit the pall-wheels and windlass-ends, being secured by keys inserted into each. By Mr. F.'s method the force exerted on the cranks or handles is thrown on the windlass body, without any twist being laid on the iron axis. The ends of the windlass are inserted into the surge-boxes, their centres are secured to the ends of the axis by keys. There is a cast-iron pall-box, with a hole of an octagonal or other form, to answer the size and shape of the shaft of the windlass, and which, being driven to the centre of the shaft, becomes a hoop to the same. The exterior of the pall-box is divided into any number of parts as occasion may require, and is so indented as to admit palls or stops, which are fixed by hinges to the pall-bitt, to fall into the said indents, and thereby prevent the windlass having a reverse motion. The pall-wheels at the ends of the windlass may have any number of teeth, so as the palls act with those at the centre; consequently the handles can he forced back but a few inches by any extraordinary resistance on the windlass-body. The drawings, attached to this speciácation, give a good view of all the parts of the machinery, and of the action of the whole; and the patentee claims, that his invention consists not only in making the improved windlass, but also of attaching or applying any of its parts to the common windlass now in use. LIST LIST OF NEW PUBLICATIONS IN JUNE. As the List of New Publications, contained in the Monthly Magazine, is the ONLY COMPLETE LIST PUBLISHED, and consequently the only one that can be useful to the Public for Purposes of general Reference, it is requested that Authors and Publishers will continue to communicate Notices of their Works (Post paid), and they will always be faithfully inserted, FREE of EXPENSE. Twenty-four Views, taken by Mr. Salt, who accompanied Lord Viscount Valentia in his Travels in India, the Red Sea, Abyssinia, &c. 271. Ös. Taking of Curaçoa, an Engraving in Co. lours. 11. 11s. 6d. 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