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Does anyone know how this is derived? I am particularly interested in how this was calculated pre the computer age. Was it based on light tonnage derived from the physical weight of components used in original construction and then assessments made from drawings to calculate the immersed area up to the loadline?

I can find nothing that helps here in any old books as I am particularly curious how sister ships vary by a few tons and was interested in how it was calculated. Any surveyors please !
 
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