The first submersion trials of “No. 1” were carried out on February 5, 1902. She went under water with some officers of the _Hazard_ t.g.b., the mother ship to the submarines (Captain R. H. S. Bacon, D.S.O.) on board, and most satisfactory results were obtained. Her appliances for the purification of the air were used to maintain atmospheric conditions without any need of her cylinders of compressed air being requisitioned. The first deep sea trials of “No. 1” took place at the beginning of April last in the Irish Sea. The submerging was accomplished in less than six seconds. From the “awash” conditions she suddenly disappeared and then came again into sight some yards’ distant with great rapidity and ease, and the diving was continued at intervals for several hours at a time without any perceptible hitch.[10] Footnote 10: Mr. Arnold Foster, in the House of Commons on May 29, 1902, said that the submarines had been a pronounced success, performing all that could be expected from them in the way of evolution and manœuvring. Submarine “No. 2” was launched on February 21, 1902. Certain alterations were made in her construction, rendered advisable by defects which had been discovered during the testing of “No. 1.” “No. 3” took the water on May 9th, and “No. 4” on May 23 last. During April last No. 42 t.b. was commissioned at Portsmouth as tender to the _Hazard_ t.g.b., and was sent to Barrow for a series of experiments with the submarines. The Navy Estimates for 1902–1903 provided for four further submarines, which Mr. Arnold Forster said would be an improvement on those already constructed at Barrow. The Admiralty, he added, proposed to continue the process of adding submarines to our fleet. Details of the new boats are not obtainable. APPENDIX II THE AMERICAN SUBMARINES “The Submarine Boat is a small ship on the model of the Whitehead, subject to none of its limitations, improving on all its special qualities, excepting speed, for which it substitutes incomparably greater endurance. It is not, like other small vessels, compelled to select for its antagonist a vessel of about its own or inferior power; the larger and more powerful its mark the better its opportunity.”—Mr. J. P. HOLLAND. “In my judgment, as a constructor of these boats (the new Hollands for the United States Government), and from my long experience in designing and constructing war vessels for the Government, and as the constructor of the original _Holland_, I have no doubt whatever of the endurance, habitability, durability, and reliability of these boats. * * * * *