Excerpt from Popular Mechanics Shop Notes for 1912, Vol. 8: Easy Ways to Do Hard Things; Of Daily Use to Every Mechanic; Table of Contents, Pages 1639-1645 It will not jar off, and the metal can be filed right up to the line, which makes it especially useful to tool-mak ers. To prepare the metal, simply put it in the fire, preferably inside of a piece of pipe, and heat it anywhere from a blue to a dull red. Then cool it quickly in water. This leaves the sur face blackened and. Lines scratched on it show up bright and clear, and the contrast between the black and the bright, clean-cut line is agreeably marked - Contributed by D. Hamp son, Middletown, N. Y. 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.