Machinery’s Handbook Pocket Companion is designed for anyone in the machine trades for whom convenient access to just the most basic data is at a premium. Extremely concise yet authoritative, this invaluable tool draws on the wealth of tables, charts, and text in the Machinery’s Handbook, 30th Edition . Much of the subject matter is reorganized, distilled, or simplified to enhance this book’s usability and to keep its bulk down. Both practitioners and students will find the Pocket Companion to be a convenient ready-reference to keep nearby while working on the shop or factory floor or learning the fundamentals in the school lab. While it serves as a complementary text, this book does not replace the Handbook .