 Dowding 's version of the same events differs . He states he was " tremendously impressed " by the potential , but pointed out to Bowen that the 1 @,@ 000 foot minimum range was a serious handicap . He makes no mention of the close approach , and his wording suggests that it did not take place . Dowding reports that when they met again later in the day , Bowen stated that he had made a sensational advance , and the minimum range had been reduced to only 220 feet ( 67 m ) . Dowding reports this uncritically , but the historical record demonstrates no such advance had been made . 
