474 ME. E. J. REED ON THE RELATION OE EORM AND DIMENSIONS TO 
I will take it for granted that the form fig. 1 has been found satisfactory for a ship 
of such scantlings that we may consider her to he built of iron of a uniform thickness 
JTig.l. 
A 
of 6 inches, the top and bottom being weightless, and I will take fourteen knots as the 
speed at which the constant 600 was obtained. 
Now, let it be required to design a ship of equal speed, draught of water, and depth, 
but of such increased scantlings (whether of hull proper or of armour) that the weight 
shall be equivalent to a uniform thickness of 12-inch iron, the top and bottom being 
weightless as before. First, we will give to this new ship the proportions and form of 
fig. 1 ; secondly, we will give her the form and proportions of fig. 2. 
In each case the ship shall be engined with engines developing seven times their 
nominal horse-power, and weighing (with boilers, water, &c.) 1 ton per nominal H.P. 
In order that both ships may steam the same distance at the same speed, we will give 
them a coal-supply equal in each case to the weight of the engines ; but as the smaller 
ship will require less men and provisions, and a less weight of other stores, we will 
require the larger ship to carry 2000 tons, and the smaller but 1500 tons of such addi- 
tional weights. 
Taking, first, the long ship fig. 1, and assuming to be the breadth, we have 
14 3 x 50# 
I.H.P.= 
600 
=228#. 
228# 
Therefore weight of engines in tons =— =— =32*5 x tons. 
