The _Royal George_ was followed by several others of various rates and improved dimensions, notably by the _Blenheim_ (90) and the _Princess Amelia_ (80). The latter was one of the most famous ships of her day, and was constantly employed as long as she continued fit for service. In 1747 a French ship of seventy-four guns named the _Invincible_ was captured, and was found to be such an excellent vessel that her dimensions were adopted for the _Thunderer_, laid down about 1758. One of the most interesting models in the Museum is of the _Triumph_ (74), also built on the lines of the _Invincible_ in 1764. Her length of gun-decks was 171 ft. 3 in.; breadth, 49 ft. 9 in.; depth of hold, 21 ft. 3 in. In the following year was built the _Victory_, 100 guns, famous as Nelson's flagship at Trafalgar, and still afloat in Portsmouth Harbour. Her dimensions are: length of gun-deck, 186 ft.; breadth, 52 ft.; depth of hold, 21 ft. 6 in.; tonnage, 2,162. [Illustration: FIG. 55.--The _Royal George_. 1746.] The following table gives the dimensions of typical ships of war constructed about the middle of the eighteenth century:-- ---------------+---------+---------+---------+---------+---------+-------- Number of | 100 | 90 | 80 | 74 | 64 | 50 guns. | | | | | | ---------------+---------+---------+---------+---------+---------+-------- Length of | 178 ft. | 176 ft. | 165 ft. | 171 ft. | 159 ft. | 146 ft. gun-deck | | 1 in. | | 3 in. | 4 in. | | | | | | | Length of keel | 143 ft. | 142 ft. | 133 ft. | 138 ft. | 130 ft. | 120 ft. for tonnage | 6 in. | 7 in. | | 8 in. | 9-1/2 in.| 8-1/2 in. | | | | | | Extreme | 51 ft. | 49 ft. | 47 ft. | 49 ft. | 44 ft. | 40 ft. breadth |9-1/2 in.| 1 in. | 3 in. | 9 in. | 6-1/2 in.| 4-1/2 in. | | | | | | Depth of hold | 21 ft. | 21 ft. | 20 ft. | 21 ft. | 18 ft. | 17 ft. | 6 in. | | | 3 in. | 9-3/4 in.| 2 in. | | | | | | Tonnage | 2,047 | 1,827 | 1,580 | 1,825 | 1,380 | 1,046 | | | | | | ---------------+---------+---------+---------+---------+---------+--------