The _Argyll_ had a combination of six cylindrical and sixteen water-tube boilers, but in the later ships, including the _Defence_, the boilers are entirely of the water-tube type. The working pressure of the boiler is 275 lb., reduced at the engines to 250 lb. The trials of the _Argyll_ were carried through most satisfactorily,[67] and the vessel, under the new Admiralty conditions, was completed for commission by the builders. The fact that this armoured cruiser was so completed at the builder's yard is of itself evidence of the capacity and efficiency of the plant. [Illustration: decoration] [Illustration: Plate XXI. THE "ERIN," OWNED BY SIR THOMAS LIPTON, BART. (_See page 70._)] FOOTNOTES: [52] Charnock's "History of Marine Architecture," vol. iii., page 245. [53] The "Greenock Telegraph," May 4th, 1849. [54] Sir Nathaniel Barnaby's "Naval Development of the Century," page 140. [55] Sennett and Oram's "Marine Steam Engine," page 3. [56] Fincham's "History of Marine Construction," page 332. [57] _Ibid._, page 344. [58] Sir Nathaniel Barnaby's "Naval Development of the Nineteenth Century," page 113. [59] Sennett and Oram's "Marine Steam Engine," page 10. [60] "Proceedings of the Institution of Naval Architects," vol. xxx., page 278. [61] "Proceedings of the Institution of Naval Architects," vol. xxx., page 287. [62] "Encyclopædia Britannica" (1898 edition), vol. xi., page 288. [63] "Engineering," vol. lxxix., page 577, May 5th, 1905. [64] See "Proceedings of the Institution of Civil Engineers" (1899), vol. cxxxviii., part 3. [65] "The Engineer," vol. xcviii., page 15. [66] "Engineering," vol. lxxx., page 415. [67] "Engineering," vol. lxxx., page 420. [Illustration: decoration] Yachting and Yachts. [Illustration: decoration] Yacht designers and builders, when votaries of the sport, produce much better results, and in this truism we have some explanation of the success of the Scotts in the long series of yachts built during the past century. There are a few misty memories and time-worn traditions to the effect that yachting of a kind was indulged in on the Clyde in the closing years of the eighteenth century; but there are no authentic records antecedent to the nineteenth century. From 1803 onwards the Scotts have been closely identified with the pastime, and with the production in the early years of sailing yachts; and, later, of steam craft.