brother, Joseph Farey (1796–1829). Farey accepted an appointment at the lace manufactory of John Heathcoat in Devonshire, which, however, he gave up in 1823, In 1825 took the engineering direction of Messrs. Marshall's flax-mills at Leeds; this position he was obliged to relinquish in 1826 in consequence of the failure of his brother's health and the necessity for his return to London, where he resumed his profession of consulting engineer, and from that time was engaged in most of the novel inventions, important trials in litigated patent cases, and scientific investigations of the period. Farey joined the Institution of Civil Engineers as a member in 1826, served several offices in the council, and always took great interest in its welfare. His residence, 67 Great Guilford Street, Russell Square, London, was burnt down in 1850, when considerable portions of his library and documents were injured or destroyed. His health, which had been failing since the death of his wife, now received an additional shock, and he died of disease of the heart at the Common, Sevenoaks, Kent, on 17 July 1851. and was buried on the western side of Highgate Cemetery (plot no.3864). The grave, which is behind that of John Harrison in the dissenters section, no longer has a decipherable inscription. Work Instruments for drawing The necessity of accomplishing drawings with accuracy in a limited time led Farey to invent in 1807 an instrument for making perspective drawings, for which he received a silver medal from the Society of Arts in 1814. In an accompanying letter printed in the Transactions, Farey explained in general: An additional four page long explanation of Farey's "Instrument for drawing Lines to an inaccessible center" in Plate 2 (see image fig. 4, 5.) started explaining: In 1813 Farey also constructed a machine for drawing ellipses, the so-called ellipsograph. The device became so popular, that the 6th edition of the Encyclopædia Britannica (1824) included an article about it, which started with: The drawing device was described in many other publications in his days, for example in Smith's The Mechanic; Or, Compendium of Practical Inventions, 1825 (see image), and it was described in the Edinburgh Encyclopædia (1832) along with four other devices by Farey. For this invention the gold medal of the same society was awarded hun. Steam-engine indicator and indicator-diagram At the construction of ironworks in Russia since 1819 he first saw a steam-engine indicator; on