How do you photograph a snowflake? It’s an easy enough question, but one that throws up a host of problems. For one, how do you capture one single snowflake, without crushing or damaging it? Secondly, how do you keep it from melting long enough to get it in front of a camera lens? And even then, how on earth do you guarantee that you’ll be able to see it in any kind of detail?
Despite all those difficulties, one man not only managed to photograph a snowflake in astonishingly beautiful detail, but he did so more than 100 years ago—and went on to produce such an impressive library of snowflake images that his research is credited with establishing the theory that no two snowflakes are alike.
Wilson Alwyn “Willie” Bentley was born on a small farmstead in Jericho, Vermont, on February 9, 1865. His mother, a former schoolteacher, owned a microscope which she had used in her lessons and which Bentley—who had an unquenchable thirst for knowledge fueled by reading his mother’s entire set of encyclopedias as a child—soon became fascinated by. But alongside the fragments of stones and birds’ feathers that Bentley collected and observed through his microscope, from an early age his curiosity landed on one subject: snowflakes.
Working during the winter from a freezing cold room at the back of the family farmhouse, Bentley would collect airborne ice crystals on the microscope’s slide, and quickly work to focus on them before they began to melt or lose their shape. In the early days of his work, he simply recorded the countless different shapes and forms he saw by drawing them as best he could in a notebook. But knowing full well that these rough sketches were no substitute for the astonishing complexity that he saw under his microscope, he soon sought other ways to record what he discovered.
Bentley asked his father for a bellows camera—an early type of still camera, with a pleated, accordion-like body that could be used to alter the distance between the lens and the photographic plate—and with no photographic training himself, attached a microscope lens. What followed was a long and immensely frustrating period of trial and error, with innumerable failed attempts along the way. But finally, during a snowstorm on January 15, 1885, Bentley succeeded in taking a single perfect image. He later wrote:
"The day that I developed the first negative made by this method, and found it good, I felt almost like falling on my knees beside that apparatus and worshipping it! It was the greatest moment of my life."
Bentley is now credited with taking the earliest known photograph of a single snowflake in the history of photography. He was just shy of 20 years old at the time—and he wasn’t done yet.
For more than a decade, he continued to perfect not only his photographic skills, but his snowflake-collecting technique too. Working swiftly (and mainly outside) to avoid the risk of them melting or evaporating, Bentley would collect the snowflakes on a tray, covered with a swatch of black velvet, that he would leave outside during bad weather. Individual snowflakes could then be transferred onto a pre-chilled glass microscope slide using a small wooden peg, where they could be photographed in astonishing detail. Bentley eventually amassed a library of several hundred snowflake images—and as word spread of his work, it soon attracted the attention of scientists at the nearby University of Vermont.
George Henry Perkins, a professor of natural history and the official state geologist of Vermont [PDF], persuaded Bentley to write, with his assistance, an article outlining both his method of photographing snowflakes, and his groundbreaking findings. Although initially reluctant (Bentley was an introverted character, and reportedly believed his modest home-schooling could not possibly have led to him discovering anything that wasn’t already known to science), he eventually agreed, and in May 1898 published A Study of Snow Crystals. In it, Bentley’s writing shows just how passionate he was about his subject:
"A careful study of this internal structure not only reveals new and far greater elegance of form than the simple outlines exhibit, but by means of these wonderfully delicate and exquisite figures much may be learned of the history of each crystal, and the changes through which it has passed in its journey through cloudland. Was ever life history written in more dainty hieroglyphics!"
Several more articles in ever more weighty publications—including Harper’s Monthly, Popular Mechanics, and even National Geographic—followed, and soon Wilson “Snowflake” Bentley’s astonishing research became known nationwide. He began giving talks and lectures on his work all over the country, and slides of his astounding snowflake photographs were sold all across America to schools and colleges, museums, and even jewelers and fashion designers looking for inspiration for their latest creations. And throughout it all, Bentley continued to work.
But not without controversy. When, in 1892, a German scientist named Gustav Hellmann asked a colleague to photograph snowflakes, the resulting flake photos were nowhere near as gorgeous or symmetrical as Bentley's. Eventually, Hellmann accused Bentley of manipulating his photographs. According to New Scientist [PDF]:
"What is clear is that Bentley gave his white-on-white images a black background by scraping the emulsion off the negatives around the outline of each snowflake. But did he sometimes scrape away asymmetries too? Hellmann claimed he had 'mutilated the outlines,' and Bentley’s defense of his methods is not entirely reassuring. 'A true scientist wishes above all to have his photographs as true to nature as possible, and if retouching will help in this respect, then it is fully justified.'"
Though their feud raged on for decades, Bentley never changed his methods of photographing snowflakes. And though he expanded his studies during warmer weather to include investigations into the structure and formation of dew, mist, and rainfall—he even proposed radical meteorological theories linking raindrop size to different storm types [PDF] and devised a way to measure the size of raindrops that involved letting them hit a tray containing a layer of sifted flour, then weighing the ball of paste each raindrop produced as it hit—Bentley’s first love always remained the same. Having continued his painstaking research, by the 1920s he had amassed a gallery of more than 5000 snowflake images, some 2400 of which were selected for publication in a book, Snow Crystals, in 1931.
Later that year, however, his work finally got the better of him: After walking six miles home during a blinding blizzard, Bentley caught pneumonia and died at the family home in Jericho on December 23, 1931. He left his extraordinary library of photomicrographs to his brother Charlie, whose daughter donated them to the Buffalo Museum of Science in New York in 1947.