308 Mr. Reed on the Fornix Dimensions, [Mar. 19, 





Long ship. 



Shorter ship. 





581 feet. 



83 



1350 H.P. 

 9450 „ 



12570 tons. 

 1350 „ 

 1350 „ 

 2000 „ 



17270 , 



342 feet. 

 68i „ 

 1337 H.P. 

 9359 „ 

 7576 tons. 

 1337 „ 

 1337 „ 

 1500 „ 

 11750 „ 



It will therefore be seen that, by adopting the proportions and form of 

 the shorter ship, a ship of the required scantlings and speed will be ob- 

 tained on a length of 342 feet and a breadth, of 68| feet ; whereas if the 

 proportions of the long ship are adopted, the ship, although of the same 

 scantlings and speed only, will require to be 581 feet long and 83 feet 

 broad, the steam-power in both cases being as nearly as possible the same. 



Considerations of this character, worked out more fully, led the designer 

 of the * Bellerophon' to depart so considerably from the form and propor- 

 tions of the ' Warrior.' 



The next part of the investigation is based upon the official reports of 

 the measured mile trials of the * Minotaur ' and * Bellerophon ' when fully 

 rigged, and upon calculations made from the drawings of those ships. It 

 is assumed that a prismatic vessel having the same mean draught as each 

 of these ships, and having the same form and dimensions as the mean hori- 

 zontal section (which equals the mean displacement in cubic feet, divided 

 by the mean draught of water), will give the same constant as the ship 

 herself, at the assumed speed of 14 knots, which, as nearly as possible, 

 equals the speed obtained by both the 'Minotaur' and * Bellerophon ' on 

 the measured mile. For each ship the weight of the armour and backing 

 is supposed to be uniformly distributed over vertical prismatic sides of the 

 dimensions of the armoured sides ; and the weight of hull is similarly dis- 

 tributed over vertical prismatic sides of the dimensions below water of the 

 mean horizontal section, and above water of the armoured side. The 

 actual weights carried by the ships are thus transferred to what may be 

 termed representative prismatic vessels, having the same constant of per- 

 formance as the ships. The detailed calculations in the Paper show that 

 the weight per square foot of the material in the hulls of the two ships, 

 when distributed over the sides of the representative prismatic vessels, is 

 very nearly the same for both ; and the same holds with respect to the 

 weight per square foot of armour and backing. The * Minotaur ' is rather 

 heavier in both respects; but, for the reasons given in the Paper, the 

 means of the values found for the two ships are taken, and are found to be 



Weight per square foot of hull = -152 ton. 



„ „ „ armour and backing =• 11 ton. 



The questions next considered are these : presuming it to be uecessar 



