sentences:  An advanced feature was that the controls were operated by rods mounted within the airframe rather than cables carried externally, as was more usual at the time.The very small gap between the top wing and the fuselage gave the pilot excellent visibility above, but probably precluded the fitting of a standard (S.E.5 type) Foster mounting for the upper Lewis gun; existing photographic evidence points to a fixed gun pointing up at a slight angle to clear the propeller arc.This would not have been conducive to Ball's favourite attack from behind and below, as is often stated (see illustrations), although, if the type had gone into production it is possible that a variant of the "Nieuport type" Foster mounting would have been devised, to allow the Lewis to be fired at various upward angles, including the steep one favoured by Ball, as well as at a flat angle directly forwards.