[Humphrey Lloyd, Irish physicist, Provost of Trinity College, Dublin.] Autograph Letter Signed ('H Lloyd') to Alfred Fox, regarding his 'paper on Magnetical Observations' and Fox's brother's 'instrument', i.e. Robert Were Fox's magnetic dip compass.

Humphrey Lloyd (1800-1881), Irish physicist, Provost of Trinity College, Dublin [Robert Were Fox the Younger (1789-1877), geologist, inventor of the magnetic dip compass]
Publication details: 
Trinity College Dublin. 24 March 1835.

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.

Reports regarding Sir William Thomson's Compass and Sounding Machine

Sir William Thomson
Publication details: 
Glasgow (1876)

(Lord Kelvin) 19 leaves (printed one side only), 4to, not bound. A rare promotional brochure and price list for navigational instruments including the dry-card compass, the first modern compass. Thomson had invented the compass the previous year. The reports are accompanied by statistics and are from Captains of vessels experimenting with the new invention (White Star, P & O, etc.)

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