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This was the principle of the shell launched by the Zalinski pneumatic gun with which experiments had already been made at that epoch, but its results were multiplied at least a hundred-fold. If, therefore, Thomas Roch's invention possessed this power, it assured the offensive and defensive superiority of his native country.
Captain Zalinski, of the United States Artillery, suggested a method of gun construction by which the shells could be projected by a steady pressure of compressed air instead of by the sudden force of powder gases. This system has been steadily improved until the pneumatic dynamite gun now works perfectly and is a marvel of destructiveness.
The effect is that of the Zalinski shell, but centupled by the infinite power of Roch's fulgurator. What shouts the bandits raise as they rush towards the extremity of the point! Ker Karraje, Engineer Serko, and Captain Spade remain rooted to the spot, hardly able to credit the evidence of their own eyes.
Does he insist upon preparing the explosive in secret and does he intend to keep the formula thereof to himself? I should not wonder. The manner of employing Roch's fulgurator is, I believe, very simple indeed. The projectile in which it is used requires neither gun nor mortar to launch it, nor pneumatic tube like the Zalinski shell.
"It is analogous to that of the Zalinski shell, but is a hundred times more powerful, and requires no machine for firing it, as it flies through the air on its own wings, so to speak." I listen in the hope that Engineer Serko will give away a part of the secret, but in vain. He is careful not to say more than he wants to.
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