Excerpt from The International Journal of Orthodontia and Oral Surgery, Vol. 7: January-December, 1921 Ince the publication of the August issue of this journal in which an article under the above heading was published, I have had so many inquiries by letter in regard to the making of this lock, that it has seemed advisable to give a little further description of the device together with illustrations. This lock is made of two parts 1. Lug soldered to a backing. 2. Rectangular tube to fit lug. 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.