Let you know Waterproof Cooling Fan in the past

Appliance "Waterproof Cooling Fan" fan, blowpipe and bladder, the first for the forced draft fan and blowpipe is. Ancient Egyptian pottery goldsmith had used the blowpipe with air nozzles, Incas sometimes 8 to 12 at the same time blowing brass. Later, invented the skins produced "Waterproof Cooling Fan", both ends of the capsule is divided into the duct and manually controlled by an operator inlet. This simple to use blower still some areas in recent times. Eighteenth Dynasty of Egypt Luck Mill (Rekhmir, circa 1450) tomb murals have been painted with tank-like foot "Waterproof Cooling Fan" picture. When the inlet, the operator with a rope hauled bladder, then depress the wind drum into the furnace, the furnace is equipped with a blower every four tools, two opposite operations.