Contains: 10 images
In copyright
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Credit
[Fragment]. In copyright. Source: Wellcome Collection.
Fragment (typescript, 10 sheets, numbered 7-16) beginning: "...a degenerate helix, such as a straight line or circle."
The fragment discusses the double helix model: "[The] restriction - that the phosphate-sugar groups are spatially uniform - is a great help in model building as it reduces very considerably the number of possibilities that have to be explored. Indeed at first we were unable to build any satisfactory model consistent with our assumptions, but eventually we arrived at a structure which we now believe to be correct in its broad outlines."
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