Travelling at an altitude of up to 300 feet , it soon became apparent that central London had become obscured by mist, so Spencer headed west, making a low pass near Clapham Common, causing "intense astonishment among the thousands of persons in the streets..." New York Times - 20 September 1902 - AN AIRSHIP TRAVELS NEARLY THIRTY MILES Spencer continued across the River Thames at Chelsea Bridge and continued over Kensington and Earl's Court.