Page:Popular Science Monthly Volume 88.djvu/378

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��Popular Science Monthly

���Hovering over the battle lines in Europe are battle 'planes of great size. The engines turn over slowly, giving the 'planes a lazy speed of sixty miles an hour. When a machine rises to fi^ht them off a sudden transformation takes place. Powerful engines are switched on, and at tremendous speed the birds of prey rush to the battle, with their guns belching fire

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