What you are looking at is Rosalind Franklin’s “Photograph 51”. It was THE significant breakthrough in discovering the structure of DNA. It is a picture of “double helix” taken in 1951 using a new technique that Rosalind pioneered, called X-ray crystallography. Through 100 hours of X-ray exposure from a machine, Franklin herself had refined, Rosalind and her student, Raymond Gosling, revealed the “double helix” structure.
As I mentioned, an unscrupulous man called Maurice Wilkins shared her unpublished work to competing scientists, Watson and Crick - without permission or credit.
In 1953, the men published their model of DNA with a footnote that they were “stimulated by a general knowledge” of Franklin’s and Wilkins’ photograph. Watson and Crick went on to win the Nobel Prize in 1962, even though much of their work was grounded in “Photograph 51” and Rosalind’s unpublished work.
While Rosalind Franklin died of ovarian cancer in 1958 at the age of 37, her breakthrough discovery of the structure of DNA changed science - and the world!