This page needs to be proofread.
350
��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
�� �
