60
"Don't be too sure of that. What's to prevent half-a-dozen of them jumping upon you from behind in the street? With your arms pinned to your sides you could do nothing - could you?"
"Yes; I could. I am seldom out in the streets after dark," said the little man impassively, "and never very late. I walk always with my right hand closed round the india-rubber ball which I have in my trouser pocket. The pressing of this ball actuates a detonator inside the flask I carry in my pocket. It's the principle of the pneumatic instantaneous shutter for a camera lens. The tube leads up - "
With a swift disclosing gesture he gave Ossipon a glimpse of an india-rubber tube, resembling a slender brown worm, issuing from the armhole of his waistcoat and plunging into the inner breast pocket of his jacket. His clothes, of a nondescript brown mixture, were threadbare and marked with stains, dusty in the folds, with ragged button-holes. "The detonator is partly mechanical, partly chemical," he explained, with casual condescension.
"It is instantaneous, of course?" murmured Ossipon, with a slight shudder.
"Far from it," confessed the other, with a reluctance which seemed to twist his mouth dolorously. "A full twenty seconds must elapse from the moment I press the ball till the explosion takes place."
"Phew!" whistled Ossipon, completely appalled. "Twenty seconds! Horrors! You mean to say that you could face that? I should go crazy - "
"Wouldn't matter if you did. Of course, it's the weak point of this special system, which is only for my own use. The worst is that the manner of exploding is always the weak point with us. I am trying to invent a detonator that would adjust itself to all conditions of action, and even to unexpected changes of conditions. A variable and yet perfectly precise mechanism. A really intelligent detonator."
"Twenty seconds," muttered Ossipon again. "Ough! And then - "
With a slight turn of the head the glitter of the spectacles seemed to gauge the size of