156 
REPORT— 1854. 
steamer of 350 ton 9 O.M., on paper ruled to a scale, having each distance written 
and marked on the horizontal scale at its height. From a diagram through these 
marks, the eye can detect any error in the measurements or in the curves of areas, 
and their correction may be secured, on their computation being written on the 
certificate of survey. 
The following dimensions, particulars space and displacement are to be recorded 
on register, and the seven forms of transfer, mortgage, &c., in bill:— 
Length of weather deck at its medium height . 138'9 feet. 
Depth from deck to rabbit in keel . 17 2 feet. 
External bulk to medium height of deck.34*612 cubic feet. 
Internal space to under side of deck ... 23,010 ratio to bulk, *665 
Cubical contents of hull, including lower deck, 11,602 ratio to space, ’504 
Mean of external bulk and internal space, cubic feet 28,811-f- 35=825 tons. 
Do. do. X factor *30-Register, 246 94-100 tons. 
Length between perpendiculars nt rabbits in 1 f T tn 55 
stem and stern post, 2-Srda height, 133 feet l ratio of i „ ”?£ ,!, ' 07 
Breadth nt ditto, 24 feet.7..J { De P th to breadth ° 7 
Displacement immersed to upper deck .938 tons, 18*4 high. 
Ditto to load water linn or 2-3rds height .533 „ 12 4 „ 
Ditto light water line or 1 - 3 rd height.159 „ 6’2 „ 
Area ot midship section, height of deck... 346 square feet. 
Ditto ditto 2-3rds, height of deck .288 „ 
Ditto ditto l-3rd, height of deck . 69 
T he strength of vessels, so far as regards their safety, may also be ascertained by 
recording on the certificate of Burvev a specification'in detail of the materials n» 
Bhown m the certificate survey of the 3fiO-ton vessel, from which the weight of the 
bull of a timber ship is estimated to be 184 tons, that of iron 138 tons. The exact 
space occupied by the hull can be measured by setting off the thickness of timber and 
plank nn.l iron nt measured sections on u .scale, which not only shows the disposition 
•f 1 atm a I and strength, but enables the surveyor or owner, from one measurement, 
fnrmT 1 * . bQ ? thc n,crnal bn,k and internal space; the former affording in¬ 
formation as to form, proportions, and dead-weight cargo carried; thn latter, thecnp*- 
«hnw° r f lgh V g °k dfl ' llu '“' <liffl ' rence being the cubic contents of thc hull, as shown 
■WU o 1 °' “ r n ,r° r |J0 11 cubic its ratio to the internal spare heme 
one-thTrd Ha ^ * thatof ttn iron vcssd is only -367. or the hull little more than 
loo a— n<!,,, , ,t8 H' e i,ltt,rnal apace as the basis of registered tonnage, using 
Jr'VZP W S. ,ch ft of th* same dimensions and bulk would I* 
moreecmitahle l 8 ' f bui,t of li ™ b ^. blIt 263 tons if built of iron. As much 
interna? snieo ''» P 7T 0,cd to substitute for this the mean of the external bn 
ScLtSTor* X fT T 01 ™**- Thc «»»* vessel built of timber on Lloyd* 
,hl ' ,r rr? 
TmdeTn Mr ‘again addressed to the Board of 
and the addhionnf it *'the reorganization of the Tonnage Commit^ 
WM to^m«i ff W ? bCT *. COnnectCtl with shipping and with scientific societies, 
In December ftnd1,10 improvement of the Mercantile Marine. 
apnlication «-nl J! i 3 ‘. , waa di8CUss<d the Institution of Civil Engineers, sod 
j; 
" do,,,cd - ,M,fad 
loom in'which^wo*!^ H ’"* p *Pl fl ined the construction of a new kind °f [ P° we / 
oZr. We 2v7„?«r,kS V in !° * f ™“. one brine above*. 
“"<< Stealer <econo„^i„ ““ S ° rC mCr 
