 This Δ principle was to be the fundamental basis of nearly all statistical methods of wheel-breaking and setting.Tutte exploited this amplification of non-uniformity in the differenced values and by November 1942 had produced a way of discovering wheel starting points of the Tunny machine which became known as the "Statistical Method".The essence of this method was to find the initial settings of the "chi" component of the key by exhaustively trying all positions of its combination with the ciphertext, and looking for evidence of the non-uniformity that reflected the characteristics of the original plaintext.