is much more probable that he tried to make one mould serve for two or more bodies. The inventor of the mould may have thought that it should be constructed with adjustments, so that it should cast different bodies as well as different widths of types. The practicability of a mould of this description is properly demonstrated by the old-fashioned adjustable mould for irregular bodies, or by the mould used for casting leads, which can be so enlarged or diminished that it will cast many bodies or thicknesses. If we suppose that this mould was used by Gutenberg for casting the two bodies of the Letters of Indulgence, and by the unknown printer of the Netherlands for his four bodies of English, and that it was, of necessity, newly set or adjusted each time a new font was cast, we shall at once have a precise explanation of irregularities which are unaccountable under any other hypothesis. Casting types without the system, standards and gauges which modern type-founders use, it is not surprising that the first printers made types with differences of body. It was the impracticability of casting in this primitive mould, at different times, types of uniform body, that compelled later type-founders to discard it, and to use instead a mould for each body.
The casting of the types, which was always done in the printing office, was then adjudged a proper part of a printer's trade. The earlier chroniclers said the first types were made of lead and tin. The Cost Book of the Ripoli Press specifies these metals, and obscurely mentions another which seems to have been one of the constituents of type-metal. If this conjecture can be accepted, types were probably made in the fifteenth century, as they are now, of lead, tin and antimony.[1] Not one of the millions of types founded during the fifteenth
- ↑ See page 66 of this book. Was this obscure metal antimony? The text books say that antimony was, for the first time, set apart as a distinct metal in 1490, by Basil Valentine, a monk of Erfurt. But Madden says that a book supposed to have been printed at Cologne, before the year 1473, plainly describes antimony as a metal frequently used and much abused by many monks of the thirteenth century in their pharmaceutical preparations. Lettres d'un bibliographe, 4th series, p. 115.
