The invisible rays which this machine sends out, and which will penetrate stone, iron, wood, or any other substance, must unite at a focus, and I have not been able to bring that focus nearer me than something over half a mile.

Last summer I went to an uninhabited part of Switzerland and there continued my experiments.

I blew up at will rocks and boulders on the mountain sides, the distances varying from a mile to half a mile.
I examined the results of the disintegration, and when you came in and showed me that gold, I recognized at once that someone had discovered the secret I have been trying to fathom for the last ten years.

I thought that perhaps you had come from Keely.

I am now convinced that the explosion you speak of in the Treasury was caused by myself.