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Sidney George Brown FRS (6 July 1873 – 7 August 1948) was a British electrical engineer and inventor. He is best remembered for his pioneering work on the design of gyro compasses, radio equipment and loudspeakers.
Brown was born in Chicago, the son of English parents. In 1879 his family returned to the UK and Brown began his education at a private school in Parkstone, Poole, followed by Harrogate College. During 1894-96 he studied at University College, London, and from 1892 to 1897 was a paying pupil at Crompton & Co. at Chelmsford. After leaving Crompton & Co, Brown returned to the Bournemouth area and in 1899 filed the first of his many patents.
In 1906 Brown formed the Telegraph Condenser Company (TCC), a manufacturer of capacitors, and in 1911 formed a second company S.G. Brown Ltd. to manufacture telephone equipment, radio parts, headphones and loudspeakers.
During World War I, S.G. Brown Ltd. set about developing British made gyro compasses. Prior to the war, most gyro compasses had been imported from Germany. Brown's design featured an innovation called liquid ballistic damping, to control the oscillation in the compass caused by a change of course. S.G. Brown Ltd. would go on to become a major producer of gyro compasses for ships and aircraft.
- Gregory, R. A. (1951). "Sidney George Brown. 1873-1948". Obituary Notices of Fellows of the Royal Society. 7 (20): 318–326. doi:10.1098/rsbm.1951.0003. JSTOR 769021.
- Rowland F. Pocock (2004). "'Brown, Sidney George (1873–1948)',". The Oxford Dictionary of National Biography. doi:10.1093/ref:odnb/46785.