In Pressure, the islanders work together to retrieve a wedding ring that has fallen down a sink drain. With the help of a visiting inventor, they discover what a straw, plunger, vacuum and jackhammer all have in common: They are all useful tools that operate by manipulating a force called pressure. The islanders discover the differences and similarities between devices that derive their power from changing air pressure (pneumatic machines) and from liquid pressure (hydraulic machines).
Knitting Technology: A Comprehensive Handbook and Practical Guide
The third edition of Knitting technology, widely recognised as the definitive text on the subject, has been thoroughly revised and updated to include all the latest developments. Beginning with the fundamental principles and moving on to more advanced aspects, it combines in a single comprehensive volume the basics of warp and weft knitting, fabric structures and products, the different types of machines, principles of production and terminology to provide an invaluable reference for textiles students
Boats, Ships, Submarines - and Other Floating Machines
This book answers such intriguing questions as why big ships float and submarines sink… how yachts use the wind to sail… and what instruments a ship's captain uses on the bridge.
All kids know the word “work.” But they probably don’t understand that work happens whenever a force is used to move something - whether it’s lifting a heavy object or playing on a see-saw. All About Simple Machines introduces kids to the concepts of forces, work and how machines are used to make work easier. Six simple machines are presented using fun, real-life demonstrations and clear, colorful graphics
Bursting with machines, movies, animations and gizmos, plus all the wit and humor of David Macaulay, this program explains the fascinating worlds of history's from 7000 B.C. to the present. The program is divided into four main sections : " The A-Z of Machines", "Principles of Science", "History" and "Inventors" each explaining the workings of more than 150 simple and complex machines and inventions.
