Water density data extrapolated by water weight measurements reported in Histoire Physique de la mer (1725) of L.F. Marsili

Water density data in Kg/m3 were obtained following a sequence of conversions: first, the water weight measurements (ounces, dragme, grains including the weight of the instrument in air) were converted into grains, as indicated in the Preface by Marsili: 1 pound corresponds to 12 ounces, 1 ounce to 8 dragme and 1 dragma to 60 grains. Marsili highlights on Plate IX, page 26, that 6 dragme is equivalent to 360 grains. Then distilled surface water, used by Marsili as reference water and whose weigh.