Unformatted text preview: stern-post rudder 8th century 1180 watertight compartments 5th century 1790 Rig: ef f cient sails (mat-and-batten principle) 1st century B.C. 19th century fore-and-aft rig 3rd century 9th century Gunpowder: c . 850 13th century rockets and f re lances c . 850 15th century projectile artillery c . 1200 c . 1320 explosive grenades and bombs c . 1000 16th century Magnetism: F oating magnet 1020 1190 knowledge of magnetic declination 1030 c . 1450 theory of declination discussed 1174 c . 1600 Paper: 105 1150 printing with wood or metal blocks 740 c . 1400 printing with movable type 1045 (earthenware) – 1314 (wood) – printing with movable metal type 1392 (Korea) c . 1440 Porcelain 3rd–7th century 18th century Adapted from Needham, Science and Civilisation in China , Vol. I, table 8 (CUP)....
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- Summer '10
- History, Century, Centuries, 13th century, Waterpower