#balance.weighing_machine  a scale for weighing; depends on pull of gravity
  supertype:  weighing_machine__scale  a measuring instrument for weighing; shows amount of mass
  subtype:  beam_balance  a balance consisting of a lever with two equal arms and a pan suspended from each arm
     subtype:  analytical_balance__chemical_balance  a beam balance of great precision used in quantitative chemical analysis
  subtype:  electronic_balance  balance that generates a current proportional to displacement of pan
  subtype:  microbalance  balance for weighing very small objects
  subtype:  spring_balance__spring_scale  a balance that measure weight by the tension on a helical spring
  subtype:  steelyard__lever_scale__leverscale__beam_scale  a portable balance consisting of a pivoted bar with arms of unequal length

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