Excerpt from Locomotive Dictionary: An Illustrated Vocabulary of Terms Which Designate American Railroad Locomotives, Their Parts, Attachments and Details of Construction, With Definitions and Illustrations of Typical British Locomotive Practice Acorn. A general term for the ornaments or tips te sembling the acorn, used to finish the ends of rods of various forms. Adjusting Spring (trailing Truck). 20, Figs.3893-3468. A heavy spiral spring or nest of springs used for con trolling the side motion of a two-wheel radial trail ing truck. Also called centering spring. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.