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The first bombs appeared in the US in 1854, developed by Daniel Halladay. They are, in principle, multi-blade rotors coupled to a piston pump n. A few years later, in 1883, Steward Perry made another model with metallic washes on this idea, which became the most widespread windmill of all those that existed. The multi-blade was a much lighter mill than its predecessors. Have a 3m diameter rotor, with a shovel number that ranged between 18 and 24, connected to a crank-crank mechanism. This moves a vertical axis with alternative movement that reaches a symbol pump located at the base of the tower, designed to accumulate water in a tank. It reached powers of 125 W with wind speeds of 25 km / h and had a capacity to pump 150l / m to 8m high. This type of mill was mainly used to pump water in remote areas and played an important role in the colonization of the American West. They were exported to all countries of the world, manufacturing more than 6,000,000 units, of which some 150,000 could still be in operation. The image of the multipala is as common in Australia or in Africa, as in the Spanish east, or on the island of Fuerteventura.
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