On one occasion, at my laboratory near the shores of Lake Hopatcong, I was conducting some experiments to test the efficiency of the safety chamber of a detonating fuze for exploding projectiles charged with Maximite. The huge loaded shell armed with a fuze was placed in a pit and fixed so as to be set off by electricity from a distance.

To prevent any possibility of a circuit being formed to explode the detonator while making the connections at the pit, I went into the machine-shop, and opened the switch at the other end of the wires where they were connected with the battery. Not only did I take this precaution, but I disconnected also the wires themselves, in order to make assurance doubly sure.

Returning to the pit to connect up, my assistant, my wife and my father-in-law accompanied me. My assistant descended into the pit, while we stood over him, looking on. The instant he brought the wires in contact, the detonator went off. We looked at one another in amazement. It takes time to get thoroughly scared; but, as soon as we realized the full danger through which we had passed, we were numb with fright. Even now, when I think of it, I have a creepy feeling.

We had made half a dozen tests before this, and all of the shells had exploded except one. This was the second in which the safety-chamber had proved effectual. Had it failed this time, and had the Maximite charge exploded in the huge shell, we should all have been blown to ribbons.

I rushed back to the machine-shop, where I found that a certain employee—one of those careful, painstaking souls who are always attending voluntarily to the odds and ends of work left undone by others, had discovered the wires detached from the switch. With no memory of the rule that the switch should always be left open, he forthwith connected the wires, and then, to make his culpable industry complete, he closed the switch, thus making the electric connection with the loaded shell; and, doubtless, he was comforted by a sense of duty well done. His duties in my services certainly were done, for they ended right then and there.