Excerpt from The Colliery Manager's Handbook: A Comprehensive Treatise on the Laying-Out and Working of Collieries, Designed as a Book of Reference for Colliery Managers and for the Use of Coal-Mining Students Preparing for First-Class Certificates In the use of the work by students, it is believed that the questions and answers given on the various subjects will be found specially helpful. 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.