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First Edition 1946 Second Edition 1951 Third Edition 1955 Fourth Edition 1959 Fifth Edition 1964 Sixth Edition, Third printing, 1973 Copyright 1969 National Safety Council All Rights Reserved No portion of this book mav be reproduced bv anv process without written permission of the National Safety Council, 425 North Michigan Ave , Chicago, 111 60611 International Standard Book Number 0-87912-023-1 Library of Congress Catalog'Card Number 74-76751 Printed in the United States of America 8M107308 Stock No 12136