There were a number of sketch designs prepared by Watts and Narbeth between July 1902 and November 1903. In 1903 Narbeth had a design for a uniform armament of twelve 12-inch guns (Design A) or twelve 10-inch guns (Design B), arranged as the subsequent SMS Nassau. Other designs had four 12-inch guns and from eight to twelve 9.2-inch guns. Watts worked with a restriction that beam could not exceed 79-feet 6-inches because of dockyard width. In late 1903 and early 1904 there were a number of meetings on a new design and in the February 6, 1904 meeting Watts presented a design which he really liked for a battleship with a uniform armament of sixteen 10-inch guns (Watts liked all 10-inch but Narbeth liked all 12-inch) but this was too large of a warship for the Admiralty. The concept of an all big gun battleship was far too radical for the majority of the Admiralty at the time. In a meeting on February 10, 1904 the decision has made to work up detailed plans for design G5, which had been submitted in the batch of designs of November 13, 1903. This design had four 12-inch guns mounted traditionally in twin gun turrets on centerline fore and aft and ten 9.2-inch guns mounted in three wing per side with twin gun turrets fore and aft and single gun turrets between the twin gun turrets. The G5 design called for a length of 405-feet (pp), beam of 79-feet 6-inches, draught of 27-feet, 16,500-tons displacement and with a machinery plant developing 16,500shp for a top speed of 18-knots. The final plans were completed on August 1, 1904 and matched the G5 design except that they were five feet longer (410-feet (pp). In January 1905, before these battleships were laid down, the scenery had dramatically changed at the Admiralty as Jackie Fisher had become First Sea Lord. Fisher was adamant about an all big gun battleship and consideration was made to convert the 1904 ships to all big guns. However, plans and preparations were too far advanced and the Lord Nelson and Agamemnon were laid down in May 1905.
HMS Agamemnon was laid down at the Beardmore Yard on May 15, 1903 and HMS Lord Nelson was laid down at the Palmer Yard on May 18, 1905. Lord Nelson was launched on September 4, 1906 and completed in October 1908, well after HMS Dreadnought, which was built in record speed. Displacement was 15,358-tons at load, 17,820-tons deep and 18,910-tons at extra deep. Her length was 443-feet 6-inches overall (oa), 435-feet at waterline (wl) and 410-feet between perpendicular bulkheads (pp). Beam was 79-feet 6-inches and draught 25-feet (light), 27-feet normal and 30-feet extra deep. Armament was four 12-inch/45 Mk X, ten 9.20inch Mk XI, 24 12pdr QF guns, two 3pdr and five 18-inch submerged torpedo tubes. The main armor belt was 12-inches thick with an upper strake of 8-inches. The barette armor for the main guns was 12-inches tapering to 3-inches on the rear face, while the main gun turrets had 13.5-inch to 12-inch armor. Secondary turret armor was 7-inches to 3-inches with barbette armor at 8-inches and glacis armor at 6-inches. Conning tower armor was 12-inches and armored decks of 1.3-unches for the main deck, 4-inches on the slopes of the middle deck 2-inches on the crown. For the power plant she had two sets of 4-cylinder inverted triple expansion engines with steam provided by 15 Babcock & Wilcox boilers. Designed horse power was 16,750shp for a maximum speed of 18-knots, however on trials Lord Nelson developed 17,445ihp for a speed of 18.7-knots, slightly faster than the Agamemnon on her trials.
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