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English troops attacking a French town, Hundred Years War, 1337-1453  (c1830). Artist: Unknown
 
Julius Caesar's siege of Marseilles, 49 BC (18th century). Artist: Unknown
 
Wheeled siege towers and bridges, 13th century (18th century). Artist: Unknown
 
Roman siege warfare, 1605. Artist: Unknown
 
Roman siege warfare, 1605. Artist: Unknown
 
Various forms of siege equipment, including battering rams, 1547. Artist: Unknown
 
Siege warfare, c1800. Artist: Unknown
 
Siege warfare, c1800. Artist: Unknown
 
Fortifications, c1880. Artist: Unknown
 
Attacking walls with battering rams, c1800. Artist: Unknown
 
Designs of fortifications, 1764. Artist: Unknown
 
'St Louis', Union gunboat, American Civil War, 1861-1865. Artist: Unknown
 
Telegraph construction camp during the American Civil War, 1861-1865. Artist: Unknown
 
One of General Grant's Union Field Telegraph stations during the American Civil War, 1861-1865. Artist: Unknown
 
The Pharos of Alexandria, 18th century. Artist: Unknown
 
Laying siege canon on target, from 'Le diverse et artificiose machine', 1620. Artist: Unknown
 
Guglielmo Marconi (1874-1937), Italian physicist and radio pioneer. Artist: Unknown
 
Guglielmo Marconi (1874-1937), Italian physicist and radio pioneer. Artist: Unknown
 
Opening of wireless telegraph link between Paris and Casablanca, 1907. Artist: Unknown
 
John Ericsson's sketch for his revolving turret ship 'Monitor', 1890. Artist: John Ericsson
 
John Ericsson, engineer, pictured in the Swedish army. Artist: Unknown
 
John Ericsson, engineer, 1839. Artist: Unknown
 
John Ericsson (1803-89), engineer. Artist: Unknown
 
Anton van Leeuwenhoek, Dutch pioneer of microscopy, 1723. Artist: Abraham de Blois
 
General view of a gas works, showing retorts being charged, 1835. Artist: Charles Partington
 
Sectional view of Liverpool Gas Works, 1860. Artist: Charles Partington
 
Illustration showing the working spaces of a gas works, 1828. Artist: Unknown
 
Quenching coke, South Metropolitan Gas Company's works, East Greenwich, London, 1891. Artist: Unknown
 
The condensers at the South Metropolitan Gas Company's works, East Greenwich, London, 1891. Artist: Unknown
 
Retort House, Imperial Gasworks, King's Road, London, 1876. Artist: Unknown
 
Retort House, Great Central Gas Works, Bow Common, London, 1866. Artist: Unknown
 
Exterior view of City of London Gasworks, showing gasometers and coal barges at the quay, 1876. Artist: Unknown
 
Charging retorts at the Gas Light Establishment, Brick Lane, London, 1822. Artist: Colin Mackenzie
 
Gas lighting apparatus at Royal Mint, London, 1819. Artist: Friedrich Accum
 
Gas works for lighting town or large district, 1819. Artist: Friedrich Accum
 
Men taking a break from charging the retorts, Lambeth Gasworks, 1872. Artist: Unknown
 
Early American railroad car adopted from road transport. Artist: Unknown
 
Race between Peter Cooper's locomotive 'Tom Thumb' and a horse-drawn railway carriage, 1829. Artist: Unknown
 
Baltimore and Ohio Railroad, North America. Artist: Unknown
 
United States Army Signal Corps in France operating a field radio station, July 1918. Artist: Unknown
 
United States Army Signal Corps using captured German telephone equipment, World War 1. Artist: Unknown
 
Cross-section of Edison's lamp-black (carbon) button telephone transmitter (microphone), c1891. Artist: Unknown
 
Edison transmitter and a 'pony crown' receiver, New York, c1891. Artist: Unknown
 
New York telephone subscriber making call through operator at telephone exchange, 1883. Artist: Unknown
 
Edison telephone in a wall-mounted box, New York, 1890. Artist: Unknown
 
Wall-mounted Edison carbon telephone with 'pony-crown' receiver, New York, 1879. Artist: Unknown
 
Sending and receiving apparatus with battery box at base, Edison carbon telephone, 1890. Artist: Unknown
 
Edison carbon telephone, 1879. Artist: Unknown
 
Georgius Agricola (1494-1555), German physician, mineralogist and metallurgist, c1890. Artist: Unknown
 
Georgius Agricola (1494-1555), German physician, mineralogist and metallurgist, 1881. Artist: Unknown
 
Albert (1819-1861), Prince Consort of Queen Victoria, at the Great Exhibition, 1851. Artist: John Tenniel
 
Albert, Prince Consort of Queen Victoria, and Joseph Paxton, 1851. Artist: John Tenniel
 
John Alcock (1892-1919), British aviator, 1914. Artist: Unknown
 
John Alcock (1892-1919) and Arthur Whitten Brown (1886-1948), British aviators, 1919. Artist: Unknown
 
John Alcock (1892-1919) and Arthur Whitten Brown (1886-1948), British aviators, 1919. Artist: Unknown
 
Die-stamping the channel and eye position on needle wires, Redditch, England, c1835. Artist: Unknown
 
Grinding needle points, Redditch, England, c1830. Artist: Unknown
 
James Watt, Scottish engineer. Artist: Unknown
 
James Watt, Scottish engineer, 19th century. Artist: Robert G Bell
 
Model of a Newcomen steam engine, 1856. Artist: Unknown