We have received a pamphlet from the ljoodly city of Cork, in old Ireland, which (the pamphlet) bears the above caption, surmount ed with an engraving of one of the signals. The inventor'is J. Norton, with whom we are not acquainted, but he, it seems, knowi the, " Scientific American." His pamphlet describes his signals for railroads thus: "I would pro pose as the means for the guard of a train to call the attention of the driver of the engine either to draw up, go slow, fa st, or backward to

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... oot from a steel cross-bow-or the ordinary long bow-an arrow without feathers, and hav ing fixed on its blunt head, a paper case charged with an ounce of powder; this charged case is made to explode on falling to the ground by frictiou or percussion." Thi� plan, he says,