sentences:  Despite this however, the rocking wing means of lateral control as Watson proposed it, although it had no precedent in aviation's fledgling years, its influence and impact on history have proven to be negligible.It is known that Preston Watson constructed three powered aeroplanes, of which only two were able to become airborne under their own power.There have also been claims that Watson also built and flew an unpowered "Wright Type" glider, but there is little substantial evidence to support this; Preston Watson himself never made the claim and reports of a glider only emerged after James Watson admitted that the claim to powered flight before the Wrights in 1903 was false and the machine Preston flew that year was a glider in the December 1955 issue of "Aeronautics" magazine.