Builder's Old Measurement
type: Thing
alternate name: BOM
alternate name: bm
alternate name: tons bm
alternate name: tons burden
alternate name: tons burthen
alternate name: tons byrthen
description: measurement of the internal volume of a sailing vessel (approx. 1650–1849)
additional property: PropertyValue
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additional property: PropertyValue
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additional property: PropertyValue
  property ID: P2534
  value: \text{tonnage}=\frac{(\text{length}-\frac35\text{beam}) \times \text{beam}^2}{188}
additional property: PropertyValue
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  value: WikiProject Mathematics
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  P2534:
    value: \text{tonnage}=\frac{(\text{length}-\frac35\text{beam}) \times \text{beam}^2}{188}
    source count: 0
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  P5061:
    value:
      lang: en
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    value: Q8487137
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    value label: WikiProject Mathematics
citations:
  source: Freebase Data Dumps
  stated in qid: Q15241312
  pub year: 2013
meta:
  wikidata id: Q1394540
  domain: unit_of_volume
  level: standard
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  data source: Wikidata (CC0 / public domain)
  license: https://creativecommons.org/publicdomain/zero/1.0/
  api version: v1
  served at: 2026-08-24T02:53:17.029928Z
  entity updated at: 2026-05-03T21:19:00.258443+00:00Z
  entity created at: 2026-04-10T23:35:37.609637+00:00Z