This U.S. typecase configuration is for the proposed new plan of the Lower case, in MacKellar: The American Printer (2nd ed 1866, 5th ed 1870 and still in eg 17th ed 1889). It is very similar to that proposed by Johnson: Typographia (1824), except for MacKellar's larger e box, and divided x and q boxes. The case is arranged to bring all the spacing together (apart from the quads), but overall the number of boxes remains 54, as in the standard U.S. Lower case.
The proposed lay is shown as MacKellar New.
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