thrown upon the Cable at each instant. In the electrician’s department there were to be signals every second by electrical currents passing through the entire length of the Cable, from shore-end, or from ship to ship. At the side of the vessels patent logs hung down into the water, to measure the velocity of the ship. One of these wheels, in the immersed log, was arranged to make and break an electric circuit at every revolution, a gutta percha covered wire running up from the revolving wheel on to the deck of the ship, that it might carry the current whenever the circuit was made, and record there, upon a piece of apparatus provided for the purpose, the speed of the vessel. The brakesman was to watch the tell-tale which would indicate the strain on the rope, and work his crank and loosen his grip whenever this seemed to be too great; or tighten his grip if ever the bell ceased to report that the electrical way from end to end of the Cable was free and unimpaired. An external guard had been placed over the screws of the vessels to defend the Cable from fouling in case any necessity should arise for backing the vessels. The Agamemnon had been jury-rigged for the service, her heavy masts and rigging removed, and lighter ropes and spars substituted. In the event of sudden and unforeseen storm, arrangements had been made to slip the Cable. On the decks of the paying-out vessels two large reels were placed, each wound round with two and a-half miles of a very strong auxiliary Cable composed of iron-wire only, and capable of resisting a strain of ten to twelve tons. Should the Telegraph Cable be endangered it would be divided, and the sea end attached to one of the strong supernumerary cords stored upon the reel; this being rapidly let out, would place the Cable in a depth of ocean where its safety would be secured until all danger had passed. In fine, every possible contrivance that ingenuity could devise or scientific knowledge could suggest, according to the experience then attained, had been adopted in order to secure success. Those who had toiled so long with wearied brain and anxious heart, undismayed by difficulties--not disheartened by failure, hoping when hope seemed presumptuous, but not despairing even when despair seemed wisdom, now felt that their part had been accomplished, that the means of securing the result had now passed beyond man’s control, and rested solely with a Higher Power. On the 29th of July, 1857, the U.S.N. frigate Niagara arrived at Queenstown, having been preceded by H.M.S. Leopard and H.M.S. Cyclops, which latter steamer had taken the soundings of the intended bed of the Cable. The Niagara was accompanied by the U.S.N.S. Susquehanna, to act as her convoy. H.M.S. Agamemnon had already arrived.