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gitudinal center line of the visibility opening, should be provided.
    Visibility of the bomber - (a) On the exterior of the cockpit.
    In the case of a tractor airplane, the bomber requires a field of 75° towards the front, and in addition, in the case of bi-motored airplanes or machines of the pusher type, a field of 10° in the rear.
    Visibility of the bomber - (b) In the interior of the cockpit.
    In the case of a tractor airplane, the opening in the floor should have a field of 70° towards the front, attainable with an adjustable seat. In the case of a multi-motored airplane or machines of the pusher type, they should have a field of 70° towards the front, 10° towards the rear and in the transversal plane,a field a 30° from any part of the center line of the window seat without putting the bomber in an uncomfortable position.
SIGHTS - Sighting should be provided for either in the interior or the exterior.
    The best place is on the exterior of the cockpit, at the right. But, when in this position, aiming will not fulfill the conditions of the exposed fields below, or it will be dangerous (neighborhood of the propeller, interference caused by the lower

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