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The machine represented in the ac- and spread the ore equally on the web. compa; ying engravings was invented by Dis the revolving magnet cylinder, Ransom Cook, Esq., late Superintendent driven by band and pulleys, O, N. P. L of the Clinton County State Prison, in is the trough into which the ore is disthe State of New York, and employed charged from the cylinder. X X are for the separation of the magnetic ore at mercury troughs, the one charged posithe mines in that place. Our description tively, and the other negatively, from of it is derived from the Scientific Ame- the battery, by the wires MM. The rican. The principle of this invention magnets are fixed on the revolving cylit consists in charging successively, by a der, and wound round with copper wire, battery, different rows of magnets on a the one positive and the other negative. revolving cylinder, so that the magnets These wires are carried from one magnet shall lift magnetic ore from an endless to another across the row, and brought web as it passes under the cylinder; and out at the axle of the eylinder, to form a so also that when the ore is lifted up a circular fan row of the points of the short distance the electric connection shall wires, so thaí as the cylinder revolves, be broken with the magnets, and the ore and these wires dip into the charged then drop from them into a trough, and mercury troughs, the rows of magnets be discharged into a proper receptacle. are charged and broken alternately, to

Fig. 1, is a side elevation of the ma- lift the ore from the dross, and deposit chine ; fig. 2, a top plan ; and fig. 3, a it in the receiving trough. sectional view.

K is the hook shaft or bar which is AA is the frame; B is a pulley, by nade to shake the hopper, F, as already which the cam-shaft, C, is revolved. described. His the endless web or This shaft by the cam, C, shakes the apron carrying the ore forward to the hopper, F, so as to spread the ore evenly magnels on the cylinder, D. The magacross the web, H. This is done by netic cylinder revolves to meet the ore as having a hook rod that catches the upper it comes forward on the web, and not in a 12dge of C, and is made, from the shape contrary direction, as might be inferred. of the cam, to traverse across the web, TT are the magnets. M represents the

wires from the battery. The large cy- rying goods, the weight of displacement linder is revolved by a broad band from at some distance from the stem is less the other side passing over a large pul- than the weight of hull and lading, &c., ley on the shaft of D, the magnetic cy- included in the same part of the ship. linder. E represents the copper wires This deficiency of buoyancy at the ex. that are wound around the magnets, tremities cannot be obviated, except by showing the manner in which they are adopting an entirely different plan of formed on the outside of the axle, so as construction in our men-of-war ; but we to dip into the charged mercury troughs should not increase the evils attendant and be charged. As they rise out of the on the same, when as yet no better plan troughs, the electric current is broken of carrying the armament in the bows and the magnets discharged. As the has been practically carried out. cylinder is made of wood, it is non-con- This want of displacement for those ducting, and to keep the wires from the necessary weights which, in every class axle of the cylinder, it (the axle) is of men-of-war are fixed to an almost boxed up with wood and wires turned unalterable distance from the stem, “F." up on the outside of it.

has not, apparently, taken into account, Fig. 3 shows the manner in which as appears from his conclusions. “F." the magnets are arranged on the cy- begins his conclusions as follows: linder. D, is the cylinder ; TT, the * Because the displacement or weight magnets; E, the current wires; and of the section of A before a is very X, the trough or vessel of quick much greater than the similar one besilver. The cylinder is about 30 inches fore b in B, its momentum will be in diameter, and the magnets are about

greater." five-eighths of an inch thick with four Now, the displacement of A before a polar points, the negative and the posi- cannot very properly be substituted for tive on each magnet. There is a space the weight of the section before a, these of about three-fourths of an inch between two quantities being, as said above, never each of the magnets, and a large one has equal. had ten magnets in a row with thirty “F's" next remark isrows on the cylinder. It will be ob- Because the displacement of A beserved that the wires are alternately fore a is greater than that before b in wound in the direction of the polar cur- B, so A will lose more buoyancy by the rents. One wire is now represented as passage of the wave aft than B, and a dipping in the mercury, but one-fourth will require to fall further than B beof all the magnets are charged at the fore the equalisation of weight and same time, as that number touch the buoyancy is restored.mercury on the under side of the cylin- The displacement of A will certainly der ; but the magnets are charged and lose more buoyancy than B by the pasdischarged successively in rows. The ore sage of the wave behind; but it can also is carried forward on the endless apron; afford to lose more than B, being less and the magnet cylinder, by revolving in deficient in buoyancy for the weights it the same direction as the apron, lifts the has to carry than the form B; and ore, while the dross is discharged from although the bow A will rise higher on the apron while passing over the roller. the crest of the wave, it will never fall

This machine is not an untried one. so deep in the hollow of the wave as It has been fairly tested, having been in that of B. First, at the moment when operation at Plattsburg for some time, the weights in the bow plunging in the where it is stated to have exceeded the hollow of the passing wave are supported most sanguine expectations. When ore is by an equal weight of water, the falling associated with hornblende, no other pro- ceases, and this moment must arrive cess of separation can it appears com- earlier in A than in B; the water will pare with this.

embrace the bow, B, an inch nearer to

the deck than the full bow, A, which ON FLAMBING THE BOWS OF SHIPS.-IN

possesses a greater fullness at and above ANSWER TO “F." (" MECH. MAG.," the water line.

It may be well to state that I am neiMr. Editor,-Almost in every sailing ther an advocate for an overhanging vessel, and certainly in all vessels car- bow, nor for an excessive full forebody



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