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arch bridge
entry-level STEM coding robot is designed to inspire users to learn about mechanical engineering and coding basics
): 20mm x 93mm x 52mm
wearable device can be used perfectly by either right-handed or left-handed users
ROMAN CATAPULT WOODEN KIT simple machines arch bridgeThe Roman catapult improved on the medieval design by the addition of torsion springs. Originally invented by the Greeks over 2000 years ago and widely used by the Romans in battles and sieges, the Catapult had many different methods of firing. During the Roman Empire the catapult was refined and improved. This model represents a smaller version of a common catapult style of the time. Based on drawings and written records, this Pathfinders kit
US$ 20.00
US$ 10.00
US$ 24.00
