Whether in the sailing days or since, the crossing of the Channel between Dover and Calais has been attended with an amount of misery altogether disproportionate to the shortness of the voyage. It is therefore not surprising that inventors have at one time and another attempted to design vessels which should give the maximum of speed and comfort and the minimum of sea-sickness. The English Channel Steamship Company, Limited, was formed in 1872 to adopt the plan of a steam-ship designed by Captain Dicey, and construct the steam-ship _Castalia_. His idea was that two large hulls should be used, and placed at such a distance apart that each should act as an outrigger to the other, and the whole structure should remain comparatively steady. The _Castalia_ was built by the Thames Iron Works Company. She was 400 feet long, and each hull had a beam of 20 feet, with a depth of hold of 20 feet. The distance between the two hulls was 35 feet, and they were united by strong girders. The hulls were very sharp at the ends, and flat in the floors, and the draught of water was only 6 feet. The inner sides of the hulls had a freeboard of 14 feet, and the uniting girders were slightly arched, but a difference in the methods of fixing them to the hull was made, compared with previous experience with double-hulled vessels. In former attempts to solve the problem of the navigation of twin steamers, the connecting beams had usually been placed in such a way that their ends extended under the decks of the hulls. This in the case of wood was manifestly a plan which did not permit of a very large vessel or of a certain limit of strength being exceeded. Captain Dicey’s scheme in adopting the arched form of girder was to utilise to the utmost the strength of the iron, and bind with the utmost rigidity the whole structure together. Where the girders entered the hulls the upper part was just under the deck; the girders were carried right across to the outer sides of each hull, additional strength being provided by bolting every girder to a bulkhead. The space between the hulls was decked over, and allowed ample accommodation for passengers. Each hull carried a powerful engine for driving a large paddle-wheel, the wheels being placed with a space between them amidships between the two vessels. The vessel could be steered at either end, thus obviating the necessity of turning, and a navigating bridge extended across the tops of the two paddle-boxes. It was even claimed that the ship would be large enough to carry railway trains across the Channel, but this does not seem to have been tried. As she drew only a trifle over 6 feet of water she could enter the harbours on either side of the Channel at any state of the tide, and though she was steady enough as a sea boat she was too slow, and was withdrawn from service.