He stayed in Fuller's office for the better part of an hour, then returned to the roof and thence to his own roof, where Morey junior was waiting for him. "Hello, Dick! I heard from Dad that you were going this afternoon, and came over here. I got your note and I have the things fixed up here. The plane leaves at one, and it's ten-thirty now. Let's eat lunch and then start." It was half-past eleven when they reached the flying field. They went directly to the private office which had been assigned to them aboard the huge plane. It was right next to the mail-room, and through the wall between the two a small hole had been cut. Directly beneath this hole was a table, on which the two men now set up a small moving picture camera they had brought with them. "How many of the gas sample bottles did you bring, Bob?" asked Arcot. "Jackson had only four ready, so I brought those. I think that will be enough. Have we got that camera properly placed?" "Everything's O.K., I believe. Nothing to do now but wait." Time passed--then they heard a faint whir; the ventilator machinery had started. This drew air in from outside, and pumped it up to the necessary pressure for breathing in the ship, no matter what the external pressure might be. There was a larger pump attached similarly to each of the engines to supply it with the necessary oxygen. Any loss in power by pumping the air in was made up by the lower back pressure on the exhaust. Now the engines were starting--they could feel the momentary vibration--vibration that would cease as they got under way. They could visualize the airtight door being closed; the portable elevator backing off, returning to the field house. Arcot glanced at his watch. "One o'clock. The starting signal is due." Morey sank back into a comfortable chair. "Well, now we have a nice long wait till we get to San Francisco and back, Dick, but you'll have something to talk about then!" "I hope so, Bob, and I hope we can return on the midnight plane from San Francisco, which will get us in at nine o'clock tomorrow morning, New York time. I wish you'd go right to your father's office and ask him over to our place for supper, and see if Fuller can come too. I think we'll be able to use that molecular controller on this job; it's almost finished, and with it we'll need a good designing engineer. Then our little movie show will no doubt be of interest!"