sentences:  Although somewhat neglected by aviation historians, Preston Watson's aeronautical experiments are contemporary with those of better known British pioneers, such as Alliott Verdon Roe and Geoffrey de Havilland.In many ways Watson's experiments are of at least equal historic interest today as those of his contemporaries, since his primary focus was developing an alternative means of controlling an aeroplane in flight - his "rocking wing" method of lateral control.Watson is known to have built three aeroplanes incorporating rocking wings, only two of which successfully became airborne under their own power.