ON SHIPPING STATISTICS. 241 
Association the following statistical data as to the elements of construction 
of the Bremen :— 
Length between perpendiculars of stem and rudder post.. 318 feet 
Breadth of beam .....--scerers ceeees Teh igh onaveye sree Oled ss 
Depth of hold..........- en Biss a¥ alana: HEE talons > ari ehaisl as. dn LO lines 
Mean draught of water at the time of trial........-... 18 ft. 6 in. 
Displacement (D) at trial draught ......s.eeeeeeeeee 3440 tons 
Area of maximum immersed section (A) at the trial draught 606 sq. ft. 
? f Seer 18 
Constructors’ load draught ............ oe Us et Meas i . 
Displacement at constructors’ load draught ............3440 tons 
Rate of ships’ displacement at constructors’ load draught 25 ,, perin. 
Data for laying off Peake’s curve of sections :— 
Area of immersed vertical section at the distance of 3 
length, measuring from stem.......... o Sika inate helslete 256°5 sq. ft 
Do. 4 Do. Do.....-. 486 5 
Do. 4 Do. Dose. .ees BOG iy, 
Do. 3 Do. Dowijeias ss 4895 
Do. + Do. Dox 4.125225 ooe 
Data for laying off curve of displacement :— 
Displacement at draught of 4’ 73", being ; load draught. 300 tons 
Displacement at draught of 9! 3", being 3 load draught..1165_ ,, 
Displacement at draught of 13’ 103", being # load draught 2240 ,, 
Displacement at draught of 18’ 6", or load draught ....3440 
2? 
The foregoing data afford all the particulars required for the construction 
of Peake’s curve of vertical sections, whence may be deduced the position 
of the vertical line passing through the centre of gravity of displacement, and 
also the positions of the centre of gravity of the fore and aft bodies re- 
spectively. 
It will be observed, from the foregoing data of the constructive elements 
of the Bremen, that the maximum immersed section is at the middle of the 
length, and that the vertical sections are in such ratio to each other, with 
reference to their respective positions, that the curve of vertical sections will 
be a close approximation to a parabola. 
The ratios deducible from the foregoing particulars of constructive data, 
combining Peake’s curve of immersed vertical sections with the curve of 
displacement, will give a close approximation to the type of form of the im- 
mersed hull. 
The engines of the Bremen consist of two direct-acting inverted cylinders, 
90 inches diameter, and 3 feet 6 inches stroke, fitted with expansion valves 
capable of working expansively to a high degree. All parts of the engines 
are felted and lagged with wood wherever practicable, the lower 16 feet of 
the funnel being surrounded by a casing forming a superheating chamber, 
the steam entering at the lower end, and passing off at the top into the steam 
pipes leading to the cylinders. 
On the important question as to the extent to which the ordinary smooth- 
water trial of a steamer affords a criterion of the general average perform- 
ance that may be expected of the vessel at sea, this Committee have not been 
able to obtain such an extent of returns of the comparative smooth-water 
