Catapults & Crossbows Experiment Kit
Thames & Kosmos
Build ten sleek and updated models of catapults and crossbows. These classic siege weapons from the middle ages also are great tools for teaching physics, including lessons in force, energy, motion and projectiles. Build and experiment with five different types of crossbows. The 32-page, full-color manual has illustrated step-by-step instructions. For ages 8 and up.