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Walter Tracy also described a spacing method based on the principles
he learned from Harry Smith of Linotype19. His method is probably the most influential
and well-known up to now, since it is reproduced in many typeface design publications.
Recently, portuguese type designer Miguel Sousa also developed a reliable method while
creating his typeface Calouste20.
All of the spacing methods cited above where created based in seriffed typefaces. Their
creators do not make reference to adjustments or changes in the systems when regarding
sans-serif designs. For this reason, it would be good to compare some of these methods
applied to both seriffed and sans-serif designs.