An 18th-Century brass Wilson screw-barrel type microscope,

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An 18th-Century brass Wilson screw-barrel type microscope,
unsigned, the screw-barrel focusing with horn stage, sprung slide holder, six objectives, four with screw-on ivory protective covers (each cracked), ivory handle, brass slider, four ivory sliders, each numbered and set with four specimens between mica sheets, probe mounting and sprung forceps, illustrated sheet of contents, and a booklet entitled L A Defcription, & l'Ufage Des Microscopes Portatifs, Ui le font & le venden par Edouard Scarlet, a l'Enseigne d'Archinede & du Globe en la Rue Qui s'appelle Dean-Street, proche de l'Eglise de St. Anne, dans Soho., contained in the original green plush-lined fishskin-covered case -- 7.1/8in. (18cm.) wide

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