This improvement is on that kind of chair sailed a key chair, in which a wooden pin is Iriven in by the side of the rails to tighten ;hem in their places, and deaden the sound, [t has been tried on the New York Central Railroad, and has given every satisfaction. Ihe improvement consists in placing the spike loles nearly or directly undr the key when it LS in its place, so that when the spikes and keys are in their places the heads of the spikes will be in contact with the key, which presents them from jarring out, and they, in their urn, prevent the key from shaking out also. Fig. 1 is a perspective view of the chair and tails, Fig. 2 is an end view of the chair by itself, and Fig. 3 an end view of the chair and rail. Similar letters refer to the same parts in each. A is the chair, placed at the junction of the two rails, R R. B is the key, and a a the spikes. The sides or lips of the chair, c c, are made of proper shape to grasp the rail by its flanges at the bottom, and one or both of them is made with a recess on the inside to receive B. The lips, c c, are made of requisite thick-n ess to give strength, and have ribs or beads, 6 6 ft, on them, to increase their stiffness and strength. The ends of the rails, as is usual, have notches cut in their lower flanges at a proper distance from the end, for the spikes to catch into. One of them is represented at w, Fig. 1. These holes are so placed that the spikes pass through them, and the heads of the spikes are hooked as represented, and stand under the key, and in contact with it; the key, therefore, prevents the spikes working up and down. This complete railroad chair is the invention of John S. Robinson, Levi Herendeen and George Sheldon, of Canandaigua, N. Y., and was patented by them October 27th, 1857. Further information may be obtained by addressing Robinson Herendeen, as above.