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Saturday, January 19, 2008

My approximate "lasts" formula

I have a spreadsheet that I use for generating proportions for drawing Dutch ships from the period of 1628 to 1678. One of the figures that I calculate is just for information: the size of the ship in lasts. There is a VOC-related page that gives the formula: length x beam x depth / 200. My Excel formula is somewhat different: =ROUND(BN6*BN8*BN9/210,-1). I am using 218 for the divisor and round the result. For the approximate dimensions, in Amsterdam feet, for the Dutch flagship Brederode, the size is calculated to be 350 lasten (lasts).

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