radius-bar

Century Dictionary and Cyclopedia

1. n. In a steam-engine, one of a pair of rods pivoted at one end and connected at the other with some concentrically moving part which it is necessary to keep at a definite distance from the pivot or center. Also called radius-rod and bridle-rod. See cuts under grasshopper-beam and paddle-wheel.
2. n. A link or bar connected with the front truck of a locomotive so as to permit it to swing laterally enough to adjust itself to track-curves of varying radius without stress upon the frame.