Ready reckoner for ship's cargoes

Calculating scale, 1807.
Ready reckoner, boxwood weighted with brass, for gross and tare weights of ship's cargoes, engraved "Robert Ludgate, Custom House, London, 1807". Tare is the weight of the packaging or container. Scales are given for finding the gross weight if the tare weight is set at at 7lbs or at a percentage of the weight of the goods.
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