An exhibition-standard 19th-Century nickel-plated and brass trephine,

细节
An exhibition-standard 19th-Century nickel-plated and brass trephine,
signed CHARRIÈRE, the turned ivory handle with ratchet, the adjustable blade, with sliding brass collar, moving along the calibrated shank, blued-steel thumb screws -- 5½in. (14cm.) long

See Front Cover
出版
Maison Charrière Robert & Collin Successeurs ... Catalogue avec Planches, Présenté au Jury de l'Exposition Universelle (Paris, 1867). Cf. pl. 45, figs. 36 & 37 for a similar instrument.