If during a permeability test on a soil sample with a falling head permeameter, equal time intervals are noted for drop of head from $h_{1}$ to $h_{2}$ and again from $h_{2}$ to $h_{3}$ then which one of the following relations would hold good?

- 1
  
  ${h_{3}}^{2} = h_{1} h_{2}$
- 2
  
  ${h_{2}}^{2} = h_{1} h_{3}$
- 3
  
  ${h_{1}}^{2} = h_{2} h_{3}$
- 4
  
  $(h_{1} - h_{2}) = (h_{2} - h_{3})$

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