about nine o’clock
And , indeed , I had now every reason to be terrified . My distance from the moon was comparatively trifling , while the labor required by the condenser was diminished not at all , and I could discover no indication whatever of a decreasing rarity in the air . `` April 19th . This morning , to my great joy , about nine o'clock , the surface of the moon being frightfully near , and my apprehensions excited to the utmost , the pump of my condenser at length gave evident tokens of an alteration in the atmosphere . By ten , I had reason to believe its density considerably increased . By eleven , very little labor was necessary at the apparatus ; and at twelve o'clock , with some hesitation , I ventured to unscrew the tourniquet , when , finding no inconvenience from having done so , I finally threw open the gum-elastic chamber , and unrigged it from around the car . As might have been expected , spasms and violent headache were the immediate consequences of an experiment so precipitate and full of danger .