Construction
The shields are made of a copper alloy sheet about 0.6 mm thick. The alloy is a high-tin bronze: copper with 11-14% tin. They are round with a central domed boss created by hammering out from the back. The shield disk is decorated with concentric rings of raised ridges a couple of millimetres high. Between the ridges are rings of small hemispherical bosses about 4 mm across. Decoration was formed by hammering from the reverse (Repoussé).
The outer edge of the shield has been folded back and hammered down to form a strong rim. A handle made from a thicker piece of sheet bronze folded over is riveted across the open bowl of the boss, also attached are a pair of metal tabs for a carrying strap. Rivet heads for fitting attachments are on the front, but are similar to the decorative raised bosses and difficult to identify.
Probably a flanged punch created the bosses to a uniform size and depth, although no contemporary tool has been found to accomplish this. The embossing would probably require the work piece to be supported, conceiveably by a bed of pitch or lead. That some eye-judgement was required is revealed in the detail of the spacing of the bosses: as the craftsman came to complete a ring, the spacing would be changed slightly so as to ensure an even design and make the starting place inconspicuous. The shields show a high degree of accomplishment, and given the degree of similarity, it is likely that all were made in the same workshop by a few craftsmen.
Read more about this topic: Yetholm-type Shield
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