(1) Find the four radii by the formulae proposed by me.
(2) With these values of the radii as well as given values of thickness and interval t's, find s₁′, s₂′ and s₃′.
(3) With thege s′'s and t's, calculate ω₁, ω₂ and ω₃ [Use the formulae (I)].
(4) With the values of the radii found in (1) and with the given values of t's, calculate Q₁, Q₂, Q₃ and Q₄. [Use the definition formula of Q].
(5) Next calculate the formulae (VII).
(6) And then calculate σ₄′ by (A), Γ by (B), S by (C), T by (D), and differential coefficients by (III), (IV), (V), (VI).
(7) With these values, calculate (II) and find ΔQ₁, ΔQ₂, ΔQ₃ and ΔQ₄, putting Γ=0, S=0 and T=0.
(8) Find Q₁+ΔQ₁, Q₂+ΔQ₂, Q₃+ΔQ₃ and Q₄+ΔQ₄ by the simple addition of the values found in (4) and (7).
(9) By the aid of definition formulae of optical invariants, find corrected radii from Q₁+ΔQ₁, Q₂+ΔQ₂, Q₃+ΔQ₃ and Q₄+ΔQ₄.

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