+---------------+---------+---------+--------+---------+----------+--------+ Description | Diamond | Vril | Trident| Olga | Doris | Oona +---------------+---------+---------+--------+---------+----------+--------+ Length on | 25 ft. | 28 ft. | 32 ft. | 33 ft. | 33 ft. | 34 ft. load-line | 3 in. | 4 in. | | | 8 in. | +---------------+---------+---------+--------+---------+----------+--------+ Breadth | 7 ft. | 6 ft. | 6 ft. | 5 ft. | 5 ft. | 5 ft. Extreme |2-1/4 in.| 7 in. | |8-3/4 in.| 7 in. | 6 in. +---------------+---------+---------+--------+---------+----------+--------+ Draught of | 4 ft. | 5 ft. | 6 ft. | 6 ft. | 7 ft. | 8 ft. water extreme| 6 in. | 2 in. | 3 in. | 4 in. | | +---------------+---------+---------+--------+---------+----------+--------+ Displacement |4.92 tons|7.18 tons|8.9 tons|10.4 tons|12.55 tons|12.5 tons +---------------+---------+---------+--------+---------+----------+--------+ Total | 671 | 830 | 912 | 985 | 1,116 | area of | sq. ft. | sq. ft. | sq. ft.| sq. ft. | | lower sail | | | | | | +---------------+---------+---------+--------+---------+----------+--------+ Designer | W. Baden| G. L. | W. E. | W. E. | G. L. | W. E. | Powell | Watson | Paton | Paton | Watson | Paton +---------------+---------+---------+--------+---------+----------+--------+ Date when | 1873 | 1876 | 1879 | 1883 | 1885 | 1886 built | | | | | | +---------------+---------+---------+--------+---------+----------+--------+ [Illustration: Chart.] [Illustration: Profiles of 5-tonners.] [Illustration: Sections showing decrease of breadth and increase of depth in 5-tonners--under 94 and 1730 Rules.] In the autumn of 1881 it was thought a check might be put on this development by adopting a rule somewhat easier on beam than the existing 94 one, and in 1882 it was determined that the tonnage should be reckoned in accordance with the formula:-- ((L + B){2} × B) / 1730 [Illustration: Diagram of variation under different rules.]