“Sure it is. Do come on down to five thousand feet and I’ll show you.”
“Okay, here we go. But I get the five.”
They started down. Anxiously Mary watched the recording gage. Twenty thousand, fifteen thousand, ten, eight—she opened a ventilator, then another. At five thousand they leveled off. When at last the air was changed, they dragged off their masks.
“Whew!” Sparky breathed deeply. “That’s great!”
“You don’t know half of it,” said Mary.
“Where’s your hot coffee?”
“I’ll get it.” She did. When the cork was removed steam rose from the bottle.
“Well, I’ll be!” Sparky exclaimed. “You win! How do you do it?”
“Little electric heat, that’s all.” She pointed at the connections at the base of the thermos bottle.
“Say!” Sparky beamed. “From now on, you and I travel together.”