“He told me it was going to be a demonstration against a building,” said the Professor. “I had to know that much to prepare the missile. I pointed out to him that I had hardly a sufficient quantity for a completely destructive result, but he pressed me very earnestly to do my best. As he wanted something that could be carried openly in the hand, I proposed to make use of an old one-gallon copal varnish can I happened to have by me. He was pleased at the idea. It gave me some trouble, because I had to cut out the bottom first and solder it on again afterwards. When prepared for use, the can enclosed a wide-mouthed, well-corked jar of thick glass packed around with some wet clay and containing sixteen ounces of X2 green powder. The detonator was connected with the screw top of
