Excerpt from British Standard Nomenclature of Tars, Pitches, Bitumens and Asphalts, When Used for Road Purposes and British Standard Specifications for Tar and Pitch for Road Purposes The Committee desire to place on record their indebtedness to the American corresponding members for their criticisms, which have been extremely helpful to the sub-committee during their deliberations; although, owing to the different standpoint from which the subject has been approached in this country and the United States, the sub-committee have not been able to recommend the adoption of the definitions put forward by the American Societies. The drawing up of definitions for the so-called bituminous materials used in road making, on which much confusion now exists, has been felt to be an essential preliminary to the preparation of standard specifications, and the Committee have devoted considerable time and care to the consideration of the exact meanings to be given to the terms Tar, Pitch, Bitumen, Native Bitumen, Asphalt and Native or Rock Asphalt. It is hoped that the definitions non recommended will go far to prevent the misunderstandings which at present occur in specifying materials belonging to the23 bitumen and asphaltic group. 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.