MAGNETIC

The recipient was a brother of the geologist and inventor Robert Were Fox the Younger (1789-1877), whose magnetic dip compass, constructed in the previous year, is the 'instrument' referred to at the end of the letter. (Fox's compass was used by Sir James Clark Ross on his Antarctic expedition, and was later used to discover the position of the South magnetic pole.) 1p, 4to. In fair condition, aged and creased, with traces of paper mount adhering to one edge, and repair to a closed tear with archival tape. Several folds.

80pp., 8vo. Stitched and unbound. All but the first few leaves unopened. In fair condition, on aged and worn paper, with traces of the original blue wraps adhering at spine. In manuscript at head of title-page: 'hommage de l'auteur'. At the time of his death de la Rive's work was deemed by one obituarist ' indispensable for the scientific student of electricity', and the phrase was repeated in the eleventh edition of the Encyclopaedia Britannica. Scarce: no copy in the Bibliothèque Nationale, and of the seven copies on OCLC WorldCat, five in Swiss libraries.

22pp., 8vo. Stitched and in brown printed wraps. In fair condition, lightly aged and worn, in chipped and damaged wraps with shelfmark. Unopened. In manuscript at head of front wrap: 'de la part des auteurs'. Scarce: no copy in the Bibliothèque Nationale, and only three copies on OCLC WorldCat.

35pp., 8vo. Stitched and unbound. All but the first few leaves unopened. In fair condition, on aged and worn paper, with traces of the original blue wraps adhering at spine. At the time of his death de la Rive's work was deemed by one obituarist ' indispensable for the scientific student of electricity', and the phrase was repeated in the eleventh edition of the Encyclopaedia Britannica. Scarce: no copy in the Bibliothèque Nationale, and of the nine copies on OCLC WorldCat, eight in Swiss libraries.