The biography and typography of William Caxton : England's first printer (1877)
Blades, William, 1824-1890 · London : Trübner · leaf 150
of Caxtonsbooks. But whatever method he used—whether he screwedup the types in wooden boxes, or whether he used iron chases,—one thing is very plain in nearly every book he issuedeither the justification was bad, or the pages were lockedup very loosely, for quadrats and spaces are… … Reglets, or thin pieces of hard wood the length of a line,appear never to have been used. TMien a wdiite line waswanted under a chapter head or over a colophon, em quadratswere ranged side by side for the purpose, and very oftencapital letters which had been reduced in height for the pur-pose,…
Caxton, William, ca. 1422-1491 · Printing · Printers -- Great Britain · Printing -- England Origin and antecedents
Internet Archive · University of Toronto, Robarts Library · Public Domain Mark 1.0. Free to use for anything.