law: Marine Insurance Act, 1963 
  70. Partial loss of freight 
  Subject to any express
  
  provision in the policy, where there is a partial loss of freight, the measure
  
  of indemnity is such proportion of the sum fixed by the policy in the case of a
  
  valued policy or of the insurable value in the case of an unvalued policy, as
  
  the proportion of freight lost by the assured bears to the whole freight at the
  
  risk of the assured under the policy.