Archibald C. Ketchum, of New York City, has invented a new railroad car wheel, by which all parts of the wheel, which are sub-jected to friction upon their becoming worn, can be takei out and replaced by others. The spokes, hub, and rim of the wheel are formed of separate parts, the hub and rim being of cast-iron, and the spokes of wrought iron. Dovetailed recesses' or slots are cut laterally in the inside of the rim and outside of the hiib for the reception oi the spokes, which are formed to fit very accurately. The spokes are then rivetted to the rim, and a heavy ring is shrunk upon the hub to prevent the spokes from moving from their position in the slots. The rim is chilled to obtain the requisite degree of hardness for the face and flange, and taking the whole together it forms a most substantial as well as durable wheel. Few wheels constructed, in separate parts have the requisite amount of strength to work safely, but this is so put together that it forms a very strong wheel. Measures have been, ta" "n by the inventor to secure a patent.