"Two blades," he was saying, "and one varies their angle with this. The sharper the angle, the greater the range of the ray and the shorter the effective arc. But, of course, this machine is only a model."
"Quite so," acquiesced the Baron.
"These" his hand emerged from the upper box "are the blades."
He withdrew from the apparatus a contrivance like a pair of brief tongs, of which the shanks were stout wires and the spatulates were oblongs of thin, whitish metal like aluminum, some three inches long by two wide.
"The essence of the whole thing," he said. "You see, they are hinged; one sets them wider or closer according to the range and the arc one requires. These plates they are removable. I paint the compound on them, and switch the current on through this battery."
"Ah, yes," agreed the Baron dreamily. "The compound that has to be painted on."
The thin face of the inventor turned upon him; the great eyes smoldered. "Yes," was the answer; "yes. I, I paint it on enough for three or four demonstrations, and then I throw the rest into the lake. So my secret is safe, you see."
The Baron met his eyes with the profound ironic calm of his own. "Safe, I am sure," he replied. "The safer the better. And now, where would you prefer us to arrange our explosives?"
The other shrugged his shoulders. "Where you like," he said, bending to the little black hand-bag. "Lay them on the ground or bury them, or throw them into the lake, if they're waterproof. Only don't put them too near the house. I don't want any more of my windows broken."
There was a tone of aggression in his voice, and his eyes seemed to affront them, then strayed in a moment's glance towards the house. Herr Haase, following his look, had a glimpse of the little wife upon the upper balcony looking down upon the scene. The young man with the scar it glowed at whiles, red and angry seemed to make her some sign, for she drew back out of sight at once.