Sometime during 1800's, the English firm of Walker & Sons abandoned the use of 4' reeds, replacing them in some cases with the three-rank Clarion Mixture. (The firm was established in the 1820's, and Wedgwood's book was published in 1905.) This stop was heavily blown and powerfully voiced, and consisted, according to Audsley, of 4' (8th), 2-2/3' (12th) and 2' (15th) ranks, apparently without breaks. Irwin provides no historical data, but gives the following examples at middle C:

Clarion Mixture III, Great and Swell; Holy Trinity Church, Chelsea, London, England; Walker.

Clarion Mixture III, Swell; Church of St. John the Divine, Kennington, London, England; Walker.

Clarion Mixture VI, Fanfare; Kennedy Center for the Performing Arts, Washington, D.C., USA; Aeolian-Skinner 1971.