The Jonas brothers had driven out from Brooklyn in an ice truck, arriving in daylight to get the lay of the land. Now, with the moon and stars hidden by clouds, they walked boldly in the dark, crossing the racetrack and scrambling over the inside rail into the infield. They headed for Joe Mudd’s aeroplane, choosing it because it was off to one side and easy to find. But as they approached they heard snoring. They slowed and crept closer. Two mechanicians, built like hod carriers, were sleeping under the wings. The Jonases slithered off to the far side of the infield, steering clear of Josephine Joseph’s Celere monoplane, which they had seen earlier, before night fell, was surrounded by humorless Van Dorn detectives armed with shotguns. Far across the field, they chose a different victim, not knowing it was the French-built Farman biplane owned by the Channel-crossing English baronet Sir Eddison-Sydney-Martin.

They confirmed that no one was sleeping nearby, removed the canvas shroud from one double wing, which was faintly silhouetted against the dark sky, and studied its construction. They did not know a lot about flying machines, but they recognized a truss when they saw one. The only difference between this double wing and a railroad bridge was that instead of the truss being constructed of steel uprights and diagonals, the two planes of the wing were supported by wood uprights counterbraced by diagonal wire stays.

Having figured out what made the Farman’s wing strong, the Jonas brothers set about weakening it. They felt in the dark for the turnbuckle used to tighten the strong multistranded stay that angled from the top plane to the bottom plane.

“Roebling wire,” George whispered. “Good thing Frost said no hacksaw. It would take all night to cut this.”

Shielding a flashlight in their hands, they inspected the turnbuckle. A strand of safety wire had been wrapped around it to prevent it from loosening from vibration. They carefully unwound the safety wire, unscrewed the turnbuckle to slacken the Roebling wire stay until they could remove the end from its connection to the wing, and replaced the steel anchor in that connection with a fragile one made of aluminum.

They tightened the turnbuckle until the stay hummed again, carefully rewound the safety wire exactly as they’d found it, and draped the shroud back over the wing. They took care to note which aeroplane they had sabotaged—Harry Frost had made it clear he had to know—checked the color of the wing fabric with their flashlight, left the infield and the track, found their truck, and drove to a nearby farm, where they parked and fell asleep. An hour after dawn they met Harry Frost in Hempstead where he had told them to and reported which machine they had sabotaged.

“Describe it!”

“Biplane. One propeller.”

“Front or back?”

“Back.”

“What color?”

“Blue.”