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In the first place he had offered the fulgurator to France, and made known the nature of it to the commission appointed to pass upon his proposition. The fulgurator was a sort of auto-propulsive engine, of peculiar construction, charged with an explosive composed of new substances and which only produced its effect under the action of a deflagrator that was also new.
I now know that at any rate it is not easy to regulate the aim of Roch's auto-propulsive engine. It is probable that it always bursts at the same distance, and that beyond the zone in which the effects of the fulgurator are so terrible, and once it has been passed, a ship is safe from its effects. If I could only inform the world of this vital fact! August 20.
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