The annexed engravings are views of a most important improvement in Railroad Trucks for Locomotives, Tenders, and Cars. The inventor is John L. *Vhite, master machinist at Coming, N. Y., of the Tioga Railroad. A patent was granted for the improvement on the 6th of last January, (185a.) Figure 1 isa perspective viewof the Truck; the other figures, 2, 3, 4, 5, 6, 7, S, are perspec- the improvement, and ligure 9-isa longitudinal section of a lotv truck with the improv, ment attached. The same letters refer to like In order to render the subject clear, we will state, firsts that the truck frame is united to a peculiar knuckle-joint at the centre, by strong bars of iron placed at right angles to one another (thepeculiar joint being in the centre) and attached by metal straps to the springs. The boiler or car is then secured to a saddle plate on the top of the knuckle joint at the centre of the truck, so that the whole weightis thrown first upon this joint, and then distributed from it, as a centre, over the transverse supporting bars, to the springs at the sides, and frofh them, by stirrups, over the wheels, thus equalizing the weight on all the wheels. We wouldstate, secondly,that the peculiar knuckle joint spoken of allows the Truck to have a rolling motion on the same, so that one wheel may be lower than the rest, or it may move over an elevation on an uneven track, and yet the boiler of the locomotive, or the body of the car, will scarcely be ailected by the unequal position of the wheels. We will BOW explain the minor figures of the engravings: A (fig. 3) is the saddle or top plate of the cen-tral knuckle joirt; its under side is shown in order to exhibit its convex form, and to show a semi-cylindrical projection, which has a knob at each end; this projection is a rail or rider, which is fitted into a recess, shown in the top of the circular metal block, B, (fig. 3); the knobs keep the saddle rider from moving endwise in its recess. The boiler, or car body, is bolted to the top of the saddle, A, by bolts passing down from the smoke-box. The block, B, is placed with its recess longitudinally in the direction of the length of the boiler. As the knuckle Joint is placed in the centre of the truck, the weight of the boiler rests upon the centre. C, fig. 4, is a top view of an eccentric metal cup, in which the block, B, sits, and is secured by screws, D. Fig. 5 is a collar box; it can be made in one ot more pieces. It has a recess, I, on its top, in which the cup eccentric,C, snugly sits, and in which it is fitted. This collar box is bolted to the cross brace bars of the truck-frame, as shown in section, fig. 6. F F and G are the cross or radiating metal brace bars, as shown in fig. 7. The under side of the collar box, with the brace, G, removed, is exhibited in figure There is a central opening through all these parts for the reception of a vertical axis or loose bolt. If we suppose the cup eccentric, C, to be placed in the collar box, I (a section of this box is exhibited in fig. E), then the metal block, B, fitted and secured into the cup, C (the recess placed lengthwise of the boiler), and then the saddle, A, placed on the block, B, with its projection or semi-cylindrical rider in the recess of the block, we have all the parts of the central knuckle-joint in position. A bolt is then inserted down through the central opening, E, and secured at the bottom by a nufy H; this bolt is a vertical axis, and is loose in the orifice. The boiler is then bolted to the top of the saddle plate, and as its weight comes exactly on the centre, the knuckle joint formed by the rider on the under side of the saddle, and the recess in the block, B, has a sufficient bearing for the boiler, yet allows it, and the truck also, to have a slight side rolling motion, which keeps the-boiler, or body of a car, in line, while the wheels may be moving over a very uneven or winding track. The weight of the engine, or the car, is also very equally distributed over As the boiler, or car, is placed on the centre of the truck; the springs are connected with the side radiating cross-bars, and the end of each spring rests on a stirrup, which is connected with the block of the axle box of each wheel; the weight, therefore, is taken off by the springs, as levers, and thrown equally over the wheels; each wheel, by this arrangement, has also individual freedom for separate flexi- figure 9, shows a lever resting on the two axle boxes of the wheels on one side, which lever is secured by straps to both ends of the spring, and a pedestal, K, rests on the centre of the spring. This shows the application of distributing the weight from the springs to the axle boxes by the said lever, and is useful to be applied to low trucks. Neither boiler nor car body is shown attached, and the figures are on a very small scale, but we believe a careful reader will understand the improvement that we have endeavored to render as clear as possible. The radiating brace bars, to which the knuckle joint central parts aie united, and which support the same, curve downwards at the centre, to bring the knuckle joint as low as possible. As the weight rests upon the centre, the frame of the truck, with the exception of the centre supporting brace bars, can be made much lighter than those in common The cup eccentric, C.performsan important office; by loosening the screws it can be turned so as to bring the knuckle joint formed by the block, B, and saddle, A, into proper line, to make the engine track square on the rails and for setting the engine, and is a device which will save the flanges of the wheels from wearing off The locomotive rests entirely upon the centre of the truck frame, which forms a centre bearing on the knuckle joint, and atthe same time the truck frame is kept parallel with the boiler (or a car body) by the rolling flexible knuckle joint described. As this joint equalizes the weights on all the wheels, it is a most valuable truckfor keeping on the track, and at the same time there is less danger ot any part breaking, than there is on the rigid trucks now in use. To us it appears to be a good improvement, one that will conduce greatly to the safety of railroad travelling, and to the economy of the "rolling stock." A silver medal was awarded to the inventor by the American Institute at the last Fair. These improvements, by imparting such a flexible character to the Truck, and equalizing the weight on the wheels, enable a locomo- Truck, to move over an uneven road with greater safety and economy. Our very best roads are more or less uneven, especially in the Spring, when the frost is leaving the ground, it is therefore applicable and necessary for all our railroads. The improvement wasfirstsuggestedbytheroughtrack of the Corningand Blosburg Railroad.from which the engines were continually running off; the patentee having charge of the machinery, had vice of inventing a remedy. This " Knuckle joint Truck" is the antidote to the evil; it has been eipployed with signal success for two yearson the said railroad, and is now about to be introduced on the New York and Erie and several other roads. More information may be obtained by letter addressed to the patentee as above. A small vessel of about 100 tuns, called the Comte le Horn, about to be launched at Nantes, is built ot zinc, as an experiment of the adaptation ol that metal to shipbuilding. The total amount contributed to the National Monument Society, during the month of October, and received attheir office, is 82,189.