The rest of us shrank back in momentary fear of the gigantic forces of nature which seemed let loose in the room.  The thought, in my mind at least, was:  Suppose this arch-fiend should turn his deadly power on us?

Kennedy saw us from the corner of his eye.  “Don’t be afraid,” he said with just a curl to his lip.  “I’ve seen all this before.  It won’t hurt you.  It’s a high frequency current.  The man has simply appropriated the invention of Mr. Nikola Tesla.  Seize him.  He won’t struggle.  I’ve got him covered.”

Two burly Pinkertons leaped forward gingerly into the midst of the electrical apparatus, and in less time than it takes to write it Lamar was hustled out to the doorway, each arm pinioned back of him.

As we stood, half dazed by the suddenness of the turn of events, Kennedy hastily explained: 

“Tesla’s theory is that under certain conditions the atmosphere, which is normally a high insulator; assumes conducting properties and so becomes capable of conveying any amount of electrical energy.  I myself have seen electrical oscillations such as these in this room of such intensity that while they could be circulated with impunity through one’s arms and chest they would melt wires farther along in the circuit.  Yet the person through whom such a current is passing feels no inconvenience.  I have seen a loop of heavy copper wire energised by such oscillations and a mass of metal within the loop heated to the fusing point, and yet into the space in which this destructive aerial turmoil was going on I have repeatedly thrust my hand and even my head, without feeling anything or experiencing any injurious after-effect.  In this form all the energy of all the dynamos of Niagara could pass through one’s body and yet produce no injury.  But, diabolically directed, this vast energy has been used by this man to melt the wires in the little dynamo that runs Norton’s gyroscope.  That is all.  Now to the aviation field.  I have something more to show you.”

We hurried as fast as we could up the street and straight out on the field, across toward the Norton hangar, the crowd gaping in wonderment.  Kennedy waved frantically for Norton to come down, and Norton, who was only a few hundred feet in the air, seemed to see and understand.

As we stood waiting before the hangar Kennedy could no longer restrain his impatience.

“I suspected some wireless-power trick when I found that the field wireless telegraph failed to work every time Norton’s aeroplane was in the air,” he said, approaching close to Lamar.  “I just happened to catch sight of that peculiar wireless mast of yours.  A little flash of light first attracted my attention to it.  I thought it was an electric spark, but you are too clever for that, Lamar.  Still, you forgot a much simpler thing.  It was the glint of the sun on the lens of your telescope as you were watching Norton that betrayed you.”