. Canadian Shipping and Marine Engineering January-December 1918. he strength of thesection can be estimated at any point sothat the stresses acting can at once bedetermined. Usually if the strength issufficient amidships it will be so through-out. In special cases, however, thestreng-th is estimated at any doubtfulpoint and the material disposed accord-ingly. It should, of course, be understoodthat these calculations are not to be re-garded as absolute. They really form ameans of comoarison between vessels,and it is doubtful if the stresses obtain-ed by this means reallv renresent thoseactual
. Canadian Shipping and Marine Engineering January-December 1918. he strength of thesection can be estimated at any point sothat the stresses acting can at once bedetermined. Usually if the strength issufficient amidships it will be so through-out. In special cases, however, thestreng-th is estimated at any doubtfulpoint and the material disposed accord-ingly. It should, of course, be understoodthat these calculations are not to be re-garded as absolute. They really form ameans of comoarison between vessels,and it is doubtful if the stresses obtain-ed by this means reallv renresent thoseactually existing in a vessel at se^i. In ordinary merchant vessels calcula-tions are not required. Reo-istration so-cieties have drawn un tables of scant-lings for steel vessels by means of whichthe necessary strength in any ship canbe provided. These tables have been de-rived to some extent by calculation, butfor the most part thev are based onexperience. It is not surprising, there-fore, that similar vessels built under dif-ferent societies rules vary in LOOKING INTO THE LOWER HALF, SHOWTNG LAYOUT OF MACHINERY.
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