Newly revised and updated, it presents the subject matter with extraordinary clarity, stressing theory and application equally. It will serve admirably to supplement a course in which only one of these factors is emphasized.The book begins with an introduction to the Opticalman rating. It then goes on to discuss the characteristics of light, with special emphasis on wavelengths, reflection, and refraction. Two chapters contain a detailed discussion of the formation of images by mirrors, lenses, and prisms; these explain how images are formed by thin and thick lenses, how to use the lens formula, and how to determine the location of an image formed by an optical instrument. The mechanical construction, maintenance procedures, and machining operations of basic optical instruments are explained in detail, supplemented by chapters on maintenance procedures, basic instrument repair, machine shop practices, optical and navigation equipment maintenance, night vision sights and gunsights and submarine periscopes. A helpful four-part appendix includes a glossary, common formulae used in optical repair and machine operations, prefixes and symbols used in the metric system, and English and metric system units of measurement, with common equivalents and conversions. Profusely illustrated with 370 charts, diagrams, photographs, and drawings of tools and parts of instruments — including cross-sections that reveal inner workings — this manual is especially clear and well-organized. Although designed for use in U.S. Naval training schools, it can be used to great advantage as a basic text in optics in standard technical schools, and it will be immensely valuable even to the layman who desires a knowledge of the fundamentals of optics.

    In this volume Peter Drucker focuses with great clarity and perception on the forces of change that are transforming the economic landscape and creating tomorrow's society.Drucker discerns four major areas of discontinuity underlying contemporary social and cultural reality. These are: (1) the explosion of new technologies resulting in major new industries; (2) the change from an international to a world economy-an economy that presently lacks policy, theory, and institutions; (3) a new sociopolitical reality of pluralistic institutions that poses drastic political, philosophical, and spritual challenges; and (4) the new universe of knowledge based on mass education and its implications in work, leisure, and leadership.Peter Drucker brings to this work an intimate knowledge and objective view of the particular and general. The Age of Discontinuity is a fascinating and important blueprint for shaping a future already very much with us.

    This book shows you how to influence a situation in the workplace without the direct use of power of formal authority.