Middle of your back, go straight ahead; two taps will mean fly low; three taps, land.

You got that ?" Bland, pulling down his cap and adjusting his goggles, nodded.

He drew on his gloves and slid down into the seat--alert, efficient, the Bland Halliday which the general public knew and admired without a thought for his personal traits.
"About how high ?" he leaned back to ask.

"High enough so the hum won't be noticed on the ground?
Or do you want to fly lower ?" "Top of your head means high, and on the neck, low," Johnny promptly finished his code.

Having thus made a code keyboard of Bland's person, he settled himself with his guns beside him.
Bland eased on the power, glancing unconsciously to the right and left ailerons, as he always did when he started.
The buzz of the motor grew louder and louder, the big plane quivered, started down the barren strip toward the reddening east, skimmed lighter and lighter the ground, rose straight and true, and went whirring away into the barbaric splendor of the dawn..