Excerpt from British Standard Specification for Five-Ampere, Fifteen-Ampere and Thirty-Ampere Two-Pin Wall Plugs and Sockets for Domestic Purposes (Without Earthing Connection): Revised December, 1919 Size of Plug. No. Of Holes or Glands. Diameter of each Hole or Gland. When one or more grooves are provided they shall be Of the same size as the holes, unless they are designed to clamp the wires as provided for in Clause 3. 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.