| Title | : | Early Discoveries (Crafty Inventions) |
| Author | : | |
| Rating | : | |
| ISBN | : | 1904668704 |
| ISBN-10 | : | 9781904668701 |
| Language | : | English |
| Format Type | : | Hardcover |
| Number of Pages | : | - |
| Publication | : | First published April 1, 2005 |
Progress has led to more exciting inventions in this title of the Crafty Inventions series. Find out why astronomers developed the astrolabe, learn how military signals led to the invention of the kite and how the abacus made arithmetic easy. Then get your bearings with your own working compass, look through a pinhole camera, rig-up a model boat and cast a jelly hand. Table of Astrolabe Early astronomy Spinning wheel Wheel and axle Rudder Balanced forces Glass window Melting points Compass Earth s magnetism Abacus beads Number systems Camera obscura Reflecting light Kite-flying Wind energy Furnace Making heat Stained Glass Light and colour Glossary and Index Tools and materials
