Eaton's method of determining the seismometer damping is extended, in order to make it more easily applicable to any value of period and damping.
The theory of the seismometer response to the release test is developed, showing that, for the application of this method, both release and tapping tests are equivalent.
As a summary of the work, curves are plotted corresponding to the function β = f (τ, Q), where τ is the “reduced time” during which the deflection decreases from its initial value ϕ0 (release test) or first maximum one ϕm (tapping test) to Qϕ0 or Qϕm, respectively, Q, being an arbitrary parameter smaller than unity. The graph contains seven curves, for values of Q from 0.1 to 0.5. The higher values are applicable to cases of large period and damping.