Records of the London Electric Supply Corporation Limited and successor London Electricity Board, comprising plans of Main Transmissions Networks in the London, Essex and Kent areas, 1937 - 1951; and photographs of Grove Road Sub-Station, 195-; Carnaby Sub-Station, 1952; Neckinger Sub-Station, 1958; Horseferry Road Central Bank, 1959; Barnes Substation, 1960; Beech Station 'B' Sub-Station, 1969; Cable Tunnel under Surrey Canal, 195-; and Horseferry Road and Grove Street, 1928.

Records of the Lots Road Power House, comprising minutes of Joint Committee Meetings; minutes of the Metropolitan District and London Electric Railway Companies Power House Working Committee; minutes of meetings of Trustees; and monthly reports.

Records of Cawnpore Electric Supply Corporation, comprising general ledger.

Records of the Gourepore Electric Supply Company, comprising memorandum and articles of association.

Records of Manaos Tramways and Light Company Limited, comprising: memorandum and articles of association, 1909-23; agreements, trust deeds and related items, 1908-39; share transfer schedules, 1965-1972; register of directors, 1909-1971; minutes of directors' meetings and shareholders' meetings, 1909-1975; annual reports and statements of accounts, 1910-73; papers relating to debenture holders and shareholders' meetings, 1923; correspondence, 1961-1966, 1970; register of documents sealed, 1923-73; register of mortgages, 1909-1971 and blank share and debenture certificates, 1923-71. Also correspondence of the Para Electric Railways and Lighting Company Limited.

Records of the London County Council Tramways Department, 1870-1933, including copies of relevant legislation; reports by solicitor; annual accounts; printed reports on the purchase of undertakings, methods of traction, electrification and so on, tramways development, financial matters, fares, staff and organisation and light railways; papers relating to arbitration proceedings against the London Street Tramways Company, North Metropolitan Tramway Company, London Tramways Company, London Deptford and Greenwich Tramways Company, Woolwich and South-East London Tramways Company and London United Tramways Company; arbitration concerning contract for construction of the superstructure of Greenwich Generating Station by Joseph Westwood and Company Limited; proceedings on claim for reduction of weekly hours from 56 to 48 and award thereon; proceedings on claim for increased wages for employees in the Electrical Section and award thereon.

Map of the tramways of London; maps showing the tramways of London North and South of the Thames; tramway map of London and suburbs showing the LCC tramways, their connections with other tramways and the tube railways; copies of the Official LCC Tram Map and Guide, containing descriptions of places of public interest and the tram routes serving them; 'Direct Services between North and South London - A Guide to Kingsway Tramway'; 'A Description of the System of LCC Tramways prepared on the occasion of the Annual conference of the Tramways, Light Railways and Transport Association'; issues of brochure 'The London Holiday Maker'; publicity brochures and fixture cards; regulations regarding the Electrical Power (Conduit System) on the LCC tramways; rules and regulations for conductors and drivers; 'What the progressives have done for the people's Trams', LCC election campaign literature (text and photographs reprinted from The Daily News).

Papers of Sir William Robert Grove include correspondence to and from various recipients, 1839-1877 (GR1-GR3); Grove papers: printed and manuscript drafts, including notes on a tour of Wales (possibly by his father, John Grove); notes on electricity and on electrolytic and disruptive discharges, 1848; notes on magnetism and heat; notes on the influence of light on polarised electrodes, 1856; a dialogue of continuity; drafts for a presidential address, 1866-1867 (GR4).

The collection comprises correspondence, mainly concerning meteorological readings and Daniell's religious beliefs, lecture notebooks and printed pamphlets on meteorology and the battery, certificates of membership of learned societies, and obituaries and biographies of Daniell, 1821-1990. Notably including correspondence between Daniell and friends and colleagues such as Charles Babbage, Lucasian Professor of Mathematics, University of Cambridge, Charles James Blomfield, Bishop of London, Sir Marc Isambard Brunel, engineer, Samuel Taylor Coleridge, poet, Michael Faraday, Joseph Louis Gay-Lussac, chemist, John Frederic William Herschel, astronomer, James Clark Ross, polar navigator, principally concerning meteorology and meteorological instruments, the chemistry of batteries, the publication of Daniell's books and articles, the management of the Royal Society, London, Daniell's religious beliefs, 1821-1857; manuscript copies of lectures delivered by Daniell including at King's College London and the Military School of the East India Company, Addiscombe, Surrey, 1831-1845; printed articles and pamphlets by Daniell or reviews of his work, including On voltaic combinations (London, 1836), reviews of Meteorological essays and observations (London, 1823), 1823-1860; membership certificates of Daniell to various learned societies including National Institute for the Promotion of Science, Washington, US, 1839-1845; obituaries and biographies of Daniell, 1845-1990.