Henry Fox Talbot

William Henry Fox Talbot
William Henry Fox Talbot, by John Moffat, 1864.
Born	(1800-02-11)11 February 1800 Melbury, Dorset, England
Died	Lacock, Wiltshire, England
Occupation	scientist and inventor
Known for	pioneering photography
Spouse(s)	Constance Talbot
Children	Ela (1835–1893) Rosamond (1837–1906) Matilda (1839–1927) Charles (1842–1916)
Parent(s)	William Davenport Talbot Elisabeth Fox Strangways
Awards	Royal Medal (1838) Rumford Medal (1842)

William Henry Fox Talbot (11 February 1800 – 17 September 1877) was a British scientist, inventor and photography pioneer who invented the salted paper and calotype processes, precursors to photographic processes of the later 19th and 20th centuries. His work in the 1840s on photomechanical reproduction led to the creation of the photoglyphic engraving process, the precursor to photogravure. He was the holder of a controversial patent which impacted the early development of commercial photography in Britain. He was also a noted photographer who contributed to the development of photography as an artistic medium. He published The Pencil of Nature (1844–46), which was illustrated with original salted paper prints from his calotype negatives, and made some important early photographs of Oxford, Paris, Reading, and York.

Early life

Talbot was the only child of William Davenport Talbot, of Lacock Abbey, near Chippenham, Wiltshire, and of Lady Elisabeth Fox Strangways, daughter of the 2nd Earl of Ilchester. Talbot was educated at Rottingdean, Harrow School and at Trinity College, Cambridge, where he was awarded the Porson Prize in Classics in 1820, and graduated as twelfth wrangler in 1821. From 1822 to 1872, he communicated papers to the Royal Society, many of them on mathematical subjects. At an early period, he began optical researches, which later bore fruit in connection with photography. To the Edinburgh Philosophical Journal in 1826 he contributed a paper on "Some Experiments on Coloured Flame"; to the Quarterly Journal of Science in 1827 a paper on "Monochromatic Light"; and to the Philosophical Magazine papers on chemical subjects, including one on "Chemical Changes of Color."

Photographic inventions

Latticed window at Lacock Abbey, August 1835. A positive from what may be the oldest existing camera negative.

Talbot invented the first process for creating reasonably light-fast and permanent photographs that was made available to the public, although his was neither the first such process invented nor the first one publicly announced.

Shortly after Louis Daguerre's invention of the daguerreotype was announced in early January 1839, without details, Talbot asserted priority of invention based on experiments he had begun in early 1834. At a meeting of the Royal Institution on 25 January 1839, Talbot exhibited several paper photographs he had made in 1835. Within a fortnight, he communicated the general nature of his process to the Royal Society, followed by more complete details a few weeks later. Daguerre did not publicly reveal any useful details until mid-August, although by the spring it had become clear that his process and Talbot's were very different.

Talbot's early "salted paper" or "photogenic drawing" process used writing paper bathed in a weak solution of ordinary table salt (sodium chloride), dried, then brushed on one side with a strong solution of silver nitrate, which created a tenacious coating of very light-sensitive silver chloride that darkened where it was exposed to light. Whether used to create shadow image photograms by placing objects on it and setting it out in the sunlight, or to capture the dim images formed by a lens in a camera, it was a "printing out" process, meaning that the exposure had to continue until the desired degree of darkening had been produced. In the case of camera images, that could require an exposure of an hour or two if something more than a silhouette of objects against a bright sky was wanted. Earlier experimenters such as Thomas Wedgwood and Nicéphore Niépce had captured shadows and camera images with silver salts years before, but they could find no way to prevent their photographs from fatally darkening all over when exposed to daylight. Talbot devised several ways of chemically stabilizing his results, making them sufficiently insensitive to further exposure that direct sunlight could be used to print the negative image produced in the camera onto another sheet of salted paper, creating a positive.

The "calotype", or "talbotype", was a "developing out" process, Talbot's improvement of his earlier photogenic drawing process by the use of a different silver salt (silver iodide instead of silver chloride) and a developing agent (gallic acid and silver nitrate) to bring out an invisibly slight "latent" image on the exposed paper. This reduced the required exposure time in the camera to only a minute or two for subjects in bright sunlight. The translucent calotype negative made it possible to produce as many positive prints as desired by simple contact printing, whereas the daguerreotype was an opaque direct positive that could only be reproduced by copying it with a camera. On the other hand, the calotype, despite waxing of the negative to make the image clearer, still was not pin-sharp like the metallic daguerreotype, because the paper fibres degraded the printed image. The simpler salted paper process was normally used when making prints from calotype negatives.

Talbot announced his calotype process in 1841, and in August he licensed Henry Collen, the miniature painter, as the first professional calotypist. The most celebrated practitioners of the process are Hill & Adamson. Another notable calotypist is Levett Landon Boscawen Ibbetson.

In 1842, Talbot received the Rumford Medal of the Royal Society for his photographic discoveries.

In 1852, Talbot discovered that gelatine treated with potassium dichromate, a sensitiser introduced by Mungo Ponton in 1839, is made less soluble by exposure to light. This later provided the basis for the important carbon printing process and related technologies. Dichromated gelatine is still used for some laser holography.

Talbot's later photographic work was concentrated on photomechanical reproduction methods. In addition to making the mass reproduction of photographic images more practical and much less expensive, rendering a photograph into ink on paper, known to be permanent on a scale of hundreds if not thousands of years, was clearly one sure way to avoid the problems with fading that had soon become apparent in early types of silver image paper prints. Talbot created the photoglyphic (or "photoglyptic") engraving process, later perfected by others as the photogravure process.

Patenting controversy

Miss Horatia Feilding, half-sister of Talbot, playing the harp, c. 1842

File:William Fox Talbot 1853.jpg

Talbot (far right) at the commercial establishment in Reading, 1846

London Street, Reading, c. 1845, a modern positive from Talbot's original calotype negative

Daguerre's work on his process had commenced at about the same time as Talbot's earliest work on his salted paper process. In 1839, Daguerre's agent applied for English and Scottish patents only a matter of days before France, having granted Daguerre a pension for it, declared his invention "free to the world". The United Kingdom and the British "Colonies and Plantations abroad" therefore became the only places where a license was legally required to make and sell daguerreotypes. This exception is now usually regarded as both an expression of old national animosities, still smouldering just 24 years after Waterloo, and a reaction to Talbot's initial aggressive assertion of an extremely broad claim of priority of invention. Talbot never attempted to patent any part of his printed-out silver chloride "photogenic drawing" process.

In February 1841, Talbot obtained an English patent for his developed-out calotype process. At first, he sold individual patent licences for £20 each; later, he lowered the fee for amateur use to £4. Professional photographers, however, had to pay up to £300 annually. In a business climate where many patent holders were attacked for enforcing their rights, and an academic world that viewed the patenting of new discoveries as a crass hindrance to scientific freedom and further progress, Talbot's behaviour was widely criticised. One reason Talbot later gave for vigorously enforcing his rights was that he had spent, according to his own reckoning, about £5,000 on his various photographic endeavours over the years and wanted to at least recoup his expenses.

In 1844, Talbot helped set up an establishment in Baker Street, Reading, for mass-producing salted paper prints from his calotype negatives. The Reading Establishment, as it was known, also offered services to the public, making prints from others' negatives, copying artwork and documents, and taking portraits at its studio. The enterprise was not a success.

In 1851, the year of Daguerre's death, Frederick Scott Archer publicised the wet collodion process, which made it practical to use glass instead of paper as the support for making the camera negative. The lack of detail often criticised in prints made from calotype negatives was overcome, and sharp images, comparable in degree of detail to daguerreotypes, could at last be provided by convenient paper prints. The collodion process soon replaced the calotype in commercial use, and by the end of the decade the daguerreotype was virtually extinct as well.

Asserting a very broad interpretation of his patent rights, Talbot declared that anyone using the collodion process would still need to get a calotype license.

In August 1852, The Times published an open letter by Lord Rosse, the president of the Royal Society, and Charles Lock Eastlake, the president of the Royal Academy, who called on Talbot to relieve the patent pressure that was perceived as stifling the development of photography. Talbot agreed to waive licensing fees for amateurs, but he continued to pursue professional portrait photographers, having filed several lawsuits.

In 1854, Talbot applied for an extension of the 14-year patent. At that time, one of his lawsuits, against photographer Martin Laroche, was heard in court. The Talbot v. Laroche case proved to be pivotal. Laroche's side argued that the patent was invalid, as a similar process had been invented earlier by Joseph Reade, and that using the collodion process did not infringe the calotype patent in any case, because of significant differences between the two processes. In the verdict, the jury upheld the calotype patent but agreed that Laroche was not infringing upon it by using the collodion process. Disappointed by the outcome, Talbot chose not to extend his patent.

Spectroscopic investigations

Talbot was one of the earliest researchers into the field of spectral analysis. He showed that the spectrum of each of the chemical elements was unique and that it was possible to identify the chemical elements from their spectra.

Other activities

Fox Talbot family grave in Lacock village churchyard

Talbot was active in politics, being a moderate Reformer who generally supported the Whig Ministers. He served as Member of Parliament for Chippenham between 1832 and 1835 when he retired from Parliament. He also held the office of High Sheriff of Wiltshire in 1840.

While engaged in his scientific researches, Talbot devoted much time to archaeology. He had a 20-year involvement in the field of Assyriology, the study of the history, archaeology and culture of Mesopotamia (present-day Iraq). With Sir Henry Rawlinson and Dr Edward Hincks he shares the honour of having been one of the first decipherers of the cuneiform inscriptions of Nineveh. He published Hermes, or Classical and Antiquarian Researches (1838–39), and Illustrations of the Antiquity of the Book of Genesis (1839). He was also the author of English Etymologies (1846).

Death

After many years of poor health, Talbot died in Lacock village, aged 77, and is buried there along with his wife and children.

Works

• The Pencil of Nature (1844–46)
• Loch Katrine (c. 1845) Salt print from calotype negative | 8x9 in. Birmingham Museum of Art

See also

• Talbot effect: a diffraction effect discovered by Talbot.

References

•  This article incorporates text from a publication now in the public domain: 
• Who's Who of members of parliament: Volume I 1832–1885, edited by Michael Stenton (The Harvester Press 1976)
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• (Subscription or UK public library membership required.)

External links

• Hansard 1803–2005: contributions in Parliament by William Fox Talbot
• Fox Talbot Museum
• The correspondence of William Henry Fox Talbot
• `Talbot' vs. `Fox Talbot'
• The Calotype Patent Lawsuit of Talbot v. Laroche, 1854, by R. D. Wood
• Talbot and Photogenic Drawing
• Science & Society Picture Library
• Talbot materials in the Digital Collections of the Sterling and Francine Clark Art Institute, Williamstown, Mass.
• "William Henry Fox Talbot's Open Door: Picture of the day", The Guardian, 10 December 2012

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• Works by Henry Fox Talbot at Project Gutenberg

Parliament of the United Kingdom
Preceded by Joseph Neeld and Henry George Boldero	Member of Parliament for Chippenham 1832 – 1835 With: Joseph Neeld	Succeeded by Joseph Neeld and Henry George Boldero