The electrical department was under charge of Mr. De Sauty, who had had long experience in submarine telegraphs, and who was aided by an efficient corps of assistants. Professor Thomson and Mr. Varley, as we have said, were there to examine and report for the Atlantic Company. All these gentlemen had been unceasing in their tests of the cable in every form, both while in the process of manufacture and after it was coiled in the Great Eastern. The result of their repeated tests was to demonstrate that the cable was _many times more perfect than the contract required_. With such marvellous delicacy did they test the current of electricity sent through it, that it was determined that of one thousand parts, over nine hundred and ninety-nine came out at the other end! To complete this organization and equipment caused such delays as excited the impatience of all on board. But at length, when midsummer had fully come--at noon of Saturday, July fifteenth--the song of the sailors sounded the _chant du départ_. The Great Eastern was then lying at the Nore, and she seemed to cling to the English soil which she had griped with a huge Trotman weighing seven tons, held fast by a chain whereof every link weighed seventy pounds! To wrench this ponderous anchor from its bed required the united strength of near two hundred men. At last the bottom lets go its hold, the anchor swings to the bow, the gun is fired, and the voyage is begun. A fleet of yachts and boats raise their cheers as the mighty hull begins to move. But mark how carefully she feels her way, following the lead of yonder little steamer, the Porcupine, the same faithful guide that seven years before led the Niagara up Trinity Bay one night when the faint light of stars twinkled on all the surrounding hills. Slowly they near the sea. Now the cliffs of Dover are in sight, and bidding her escort adieu, the Great Eastern glides along by the beautiful Isle of Wight, and then quickening her speed, with a royal sweep, she moves down the Channel. Off Falmouth she picked up the Caroline, a small steamer, which had left several days before with the shore end on board. She was laboring heavily with her burden, and made little headway in the rough waves. But the Great Eastern took her in tow, and she followed like a ship's boat in the wake of the monarch of the seas. Thus they passed round to the coast of Ireland, to that Valentia Bay where, eight years before, the Earl of Carlisle gave his benediction on the departure of the Niagara and the Agamemnon, and where, a year later, the gallant English ship brought her end of the cable safely to the shore.