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Furnace for processes where protracted heat required, such as cementation, 1580
 
Washing ore to extract gold, 1683
 
Double inclined plane for moving tub boats from one level to another on a canal, 1796
 
Inclined planes for use on canals, 1796
 
Inclined plane powered by water wheel in used on a canal, 1796
 
Christian Friedrich Schonbein, German chemist, c1898
 
John Ross, British polar explorer and naval officer, 19th century
 
Alexander von Humboldt, German naturalist, c1830. Artist: William Home Lizars
 
Joseph von Fraunhofer, German physicist, c1895
 
Hippolyte Fizeau, French physicist, 1870
 
Typical enlarged spleen of a Malaria patient, c1890
 
Painting a wound with an antiseptic solution, c1890
 
Using a laryngoscope to aid the removal of a polyp from the throat, c1890
 
Potato peeler, 1899
 
Villa Tournesol, 1899
 
The Wear above Sunderland Iron Bridge, c1829. Artist: R Francis
 
Boring wooden pipes, and casting and drawing iron pipes, c1825
 
Various pumps for raising water, 1816
 
Various pumps for draining ships, 1816
 
Glass cutter decorating table ware on a carborundum wheel, 1867
 
Cretin aged 15, c1890
 
Making Edison light bulbs, 1880
 
Justus von Liebig, German chemist, at work in his laboratory, mid 19th century (c1885)
 
The solar spectrum, 1814
 
Mining for rock salt, c1890
 
Antoine Laurent Lavoisier, 18th century French chemist, 1801
 
Cross section of a Newcomen-type steam engine attributed to Jean-Rodolphe Perronet, 1767
 
Newcomen-type steam engine attributed to Jean-Rodolphe Perronet, 1767
 
Frontispiece of Ontledigen en Ondekkigen...Brieven by Anton van Leeuwenhoek, 1686
 
Isaac Lea, American publisher, geologist and conchologist, 1896
 
Harry John Lawson, English inventor of a safety bicycle, 19th century
 
John Bennett Lawes, English agriculturalist, 1882. Artist: Edward Linley Sambourne
 
John Bennett Lawes, English agriculturalist, 1882
 
John Law, Comptroller General of France, 1720 (1841)
 
Antoine Laurent Lavoisier, 18th century French chemist, in his laboratory, 1814
 
Men watching a cockfight, late 18th-early 19th century. Artist: Thomas Rowlandson
 
Execution of the Earl of Ferrers at Tyburn, Paddington, London, 1760
 
Riot in Broad Street, London, 1780, (1790). Artist: James Heath
 
Claude Chappe demonstrating his optical telegraph (semaphore) system in 1793 (c1870)
 
Sectional view of a telegraph tower for Claude Chappe's semaphore, 1792, (c1870)
 
The Cabalistic analysis of the mind and the senses, 1617
 
Naturalists dining inside a model of a dinosaur, Crystal Palace, Sydenham, New Year's Eve, 1853
 
Thomas Henry Huxley, British biologist, at his desk in 1882 (1883)
 
Stone arched bridge across the Tyne at Newcastle-upon-Tyne, England, c1830. Artist: R Francis
 
Barge crossing the Barton aqueduct over the Irwell, Salford, Greater Manchester, c1794. Artist: Robert Pollard
 
Philippe Ricord, French surgeon and venereologist, 1867. Artist: Andre Gill
 
Viaduct on the Baltimore & Washington Railroad, c1838. Artist: Henry Adlard
 
Needle-making equipment, 1819
 
Henri Moissan, French chemist, c1883 (1903)
 
The Military Accelerator - Particularly Recommended to Cavalry Officers c1820
 
Jacobus Henricus Van't Hoff, Dutch chemist, 1902
 
Johann Kaspar Lavater, Swiss physiognomist and theologian, early 19th century
 
Dionysius Lardner, Irish-born scientific writer, 1835
 
Pierre Simon Laplace, French mathematician and astronomer, 18th century
 
Pierre Simon Laplace, French mathematician and astronomer, 1833
 
Pierre Simon Laplace, French mathematician and astronomer, 1881
 
Comte de La Perouse, 18th century French navigator, astronomer and explorer, c1834
 
Alexander Gordon Laing, Scottish explorer of Western Africa, 1870
 
Gustav Robert Kirchhoff, German physicist, 1873
 
Gustav Robert Kirchhoff, German physicist, 1876