about seven o'clock
Robur must evidently have been familiar with this incomparable spectacle , unique in the world , for he did not appear on deck . Was it , then , for the sole pleasure of his guests that he had brought the aeronef above the national domain ? If so , he came not to receive their thanks . He did not even trouble himself during the daring passage of the Rocky Mountains , which the `` Albatross '' approached at about seven o'clock . By increasing the speed of her wings , as a bird rising in its flight , the `` Albatross '' would clear the highest ridges of the chain , and sink again over Oregon or Utah , But the maneuver was unnecessary . The passes allowed the barrier to be crossed without ascending for the higher ridges . There are many of these canyons , or steep valleys , more or less narrow , through which they could glide , such as Bridger Gap , through which runs the Pacific Railway into the Mormon territory , and others to the north and south of it .