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In 1853, an English instrument maker named John Benjamin Dancer achieved something many believed was impossible. He managed to shrink a photograph to a size smaller than the tip of a sharpened pencil. This remarkable moment marked the beginning of microphotography, a revolutionary way to create images on a microscopic scale. Dancer's innovation would soon change how people decorated jewelry, hide secret images, and communicate safely during wars.
The earliest photographs, called daguerreotypes, came in standard sizes. The smallest versions were about the size of a modern passport photo. Dancer had traveled to London in 1839 to see the new process invented by Louis Daguerre. He started as an amateur experimenter but quickly became a master. Using a special microscope lens, he shrank an image to just three millimeters across. This was an astonishingly tiny scale for that time period.
Microphotography became much more practical with the invention of the wet collodion photographic process. This advanced method involved coating a glass plate with a light-sensitive solution. This allowed photographers to capture much finer details than before. In April 1853, Dancer applied this new technique to a photograph of a memorial plaque. The plaque honored the inventor William Sturgeon. The original image measured four by five inches and contained 680 letters of text. Dancer reduced this entire block of text to a speck only one-and-a-half millimeters wide. Yet, when viewed through a microscope, every single letter remained perfectly clear and easy to read.
To the naked eye, a microphotograph looked like an ordinary, unremarkable dot. Its contents were only revealed when viewed through a magnifying lens. During the mid-Victorian era, microscopes became very popular household items. One can easily imagine the scene where a person placed a slide with a tiny dot onto their microscope. They would peer down the tube and exclaim in surprise as the detailed image of a famous landmark or a portrait appeared. Dancer's creations quickly gained distinguished admirers. Queen Victoria owned a ring containing microphotographic portraits of her family. The ring included a jewel that served as the necessary magnifying lens. The prominent scientist Sir David Brewster was also a dedicated enthusiast. In the 1857 edition of the Encyclopædia Britannica, Brewster explained the remarkable capacity of the technology. He wrote, "A family group of seven complete portraits occupies a space the size of the head of a pin; so that ten thousand single portraits could be included in a square inch."
Not everyone was impressed by this new technology. In 1858, Thomas Sutton, the editor of Photographic Notes, dismissed microphotographs. In his Dictionary of Photography, he wrote that they had "little or no practical utility." He characterized the pursuit as "trifling and childish." Sutton was incorrect. While some uses were indeed playful, the technology would soon prove to be of immense practical value. Its most widespread early application, however, was as a form of hidden entertainment.
Brewster's promotion of the idea during a visit to Paris in 1857 caught the attention of a French merchant and photographer named René Dagron. By 1858, Dagron was experimenting with producing microphotographs as novelty items. He faced significant challenges. He had to perfect the reduction process, select the right viewing lens, decide where to hide the images, and make the enterprise commercially successful.
After more than a year of rigorous work, Dagron filed his first patent in 1859. He called his invention bijoux photomicroscopiques. They later became known as "Stanhopes," named for the type of convex magnifying lens used to view them. A Stanhope was a small personal object, such as a ring, a pipe, or a pocketknife. Dagron embedded a microscopic photograph inside it and covered it with a tiny lens. The owner could peek into the lens to see the magnified image, which otherwise remained completely hidden from view.
To mass-produce these images, Dagron utilized a clever wooden box device. At one end was a glass negative; at the other was a camera with up to twenty-five small lenses facing a sensitized glass plate. Light projected the negative image through the lenses, creating multiple positive transparencies on the plate simultaneously. Each image was about two millimeters square. He employed a dry collodion process that allowed the plates to remain sensitive after drying. By making the plate holder adjustable, Dagron could fit up to 450 microphotographs onto a single plate.
Each minuscule image was inspected with a hand magnifier. The clear ones were then cut out and glued to a cylinder of optical glass about eight millimeters long. This length was roughly the same as a human eyelash. The opposite end of the cylinder held the magnifying lens. This delicate assembly was then discreetly mounted into jewelry or trinkets for distribution. In 1864, Brewster praised Dagron's Stanhopes. He wrote that the photographs, "invisible almost to the eye, were seen so distinctly and so highly magnified that they excited general admiration." He added that a family could carry a portrait group in a locket or ring and "smile or weep even in the social circle over these cherished representations of the living or the dead." Despite competitors challenging his patent in the early 1860s, Dagron built a thriving business. By 1861, he employed 150 people. After losing his patent, he expanded his business by selling do-it-yourself microphotography kits with detailed instruction booklets.
As Stanhopes grew in popularity and more manufacturers entered the market, they could be found in a vast array of everyday objects. They appeared in watch keys, brooches, needle cases, letter openers, crucifixes, and even, in one reported case, a bullet. The images typically depicted popular subjects like landmark buildings or portraits of royalty. Yet, the very nature of a hidden image known only to its owner naturally lent itself to another subject: erotic imagery. Contemporary photographic journals described these images as "indecent," "lewd," or "objectionable." In a perfect alignment of format and function, some Stanhopes contained tiny nude images and depictions of sexual acts. These were meant to be concealed, which makes historical records of them rare. One notable account comes from South Australia in 1869. Customs officials at Port Adelaide seized a packet of watch keys. Each contained a magnifying lens that revealed "the most obscene and disgusting pictures."
One significant collection of erotic Stanhopes survives by chance. In 1959, a cardboard box containing about 2,000 erotic Stanhope lenses arrived at the Kinsey Institute at Indiana University. They had been seized by the U.S. Postal Service in 1924 while in transit from a supplier to a distributor. The collection, dated to the late 19th and early 20th centuries, consists of photographs and drawings of naked women. According to researcher Jean Scott, Dagron's own company produced erotic Stanhopes. One of the earliest was an illustration of a bare-breasted scene of seduction. These items were typically worn or used by men. Another collection was discovered accidentally in 1996. A researcher examined pocketknives salvaged from the wreck of the 1865 steamboat Bertrand. Concealed in the handles were Stanhope lenses revealing tiny drawings and a photograph depicting nudity and couples having sex. While microphotographs could contain hidden "obscene" imagery, they also carried far more serious material: secret messages during wartime.
When the Prussian army laid siege to Paris in 1870, the city was cut off from the outside world. Dagron left Paris by hot-air balloon and established an operation in the city of Tours. There, he produced microscopic copies of official correspondence and personal letters. These were to be flown into the besieged capital by carrier pigeon. He reduced the images so dramatically that a single collodion film, measuring about 1.1 by 2.3 inches, could contain approximately 3,000 messages. This film was smaller than half a standard Post-it note. Rolled up, about fifteen of these films could fit inside a goose quill. The quill was then attached to a pigeon with a silk thread. Dagron sent the same messages repeatedly until he received confirmation of their arrival via return balloon post. He later estimated that he sent about 2.5 million dispatches. The mission was perilous; many pigeons were shot, killed by trained birds of prey released by the Prussians, or lost in winter storms.
Dagron also copied entire newspaper editions in microscopic format. This provided a glimpse of the future use of microfilm for archiving. Brewster had predicted this military and archival potential back in 1857, displaying the foresight that Sutton lacked. "Microscopic copies of despatches and valuable papers and plans might be transmitted by post," Brewster wrote prophetically. "And secrets might be placed in spaces not larger than a full stop or a small blot of ink."
From a dazzling optical novelty to a vehicle for clandestine pleasure and vital communication, the history of microphotography demonstrates how a seemingly trivial technological marvel can evolve to serve profoundly different human needs. It shows the shift from the desire for hidden intimacy to the imperative of survival in war.