When I first put drill to that eight-hundred-foot-high block, directing the hands of men I could hardly see at a distance of fifteen hundred feet, I was still impressed by the thought that without some effective substitute for the thousands of enslaved craftsmen of the Egyptian days, our undertaking would never come to an end. I spent weeks experimenting with the ways and means of blocking out masses of unnecessary stone and trying by plug and feather and wedge drills to split them off. All these efforts proved childish and inadequate. After months of failures and careful calculation of costs I began to see that the work would be next to interminable with the labor we could afford and by the known means at our disposal. I had thought of explosives but, knowing little about them, had vetoed their use. The general idea is that high explosives can be used only to destroy. As I thought this subject over, much as I am writing it, another thought came to me: Why not _control_ explosive force? Firearms control it. Why not develop some means by which we could blow off just what material we wanted to be rid of, in precisely the quantities we wished to remove, and at the same time preserve the stone left in place, intact and without injury? That problem I pondered over for months without discussing it with anybody. Just at that time a Belgian engineer, who was passing through Georgia, visited me at Stone Mountain. I told him what our difficulties were, quite apart from the safety problem of carrying men to such a height apparently unprotected, to work on the side of the mountain. The removal of stone was costing too much and was too slow. The old methods were detaining the development of the design. “Why don’t you use dynamite?” he calmly asked. “I’ve been thinking of it,” I said, “and I am on the point of making experiments. But it’s close work.” He then told me that he had recently enlarged a tunnel through a ledge of granite only a few inches, and that by arranging his drilling and adjusting the charges of dynamite, he was literally able to cut off six or eight inches of the main ledge as cleanly as if it had been channeled. Of course anybody who knows anything about granite knows that it splits easily in some directions and in others is stubborn and cranky. I spoke of this and he said he had found means of overcoming that trouble.