Common
Builder's Old Measurement
Estimate of the cargo capacity of a sailing vessel (c. 1650–1849)
Builder's Old Measurement
Builder's Old Measurement (BOM, bm, OM, and o.m.) is the method used in England from approximately 1650 to 1849 for calculating the cargo capacity of a ship. It is a volumetric measurement of cubic capacity. It estimated the tonnage of a ship based on length and maximum beam. It is expressed in "tons burden" (Early Modern English: burthen, Middle English: byrthen), and abbreviated "tons bm". The formula is: Tonnage = ( Length − ( Beam × 3 5 ) ) × Beam × Beam 2...
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