She introduced me to the study of viruses and I admired the great skill with which she... got the specimens. And she wanted me to calculate, she knew I... she thought I... she knew actually I knew some mathematics, that came later. But she showed me a picture of the layer lines, which looked curved layer lines. And these were curved in a way that wasn't just due to misorientation of the specimen. So I worked out... I figured it out and we published the paper in '54, or was it '55 on the splitting of layer lines in Tobacco Mosaic Virus because I realised this was because the screw of the helix of Tobacco Mosaic Virus wasn't three turns and 69 angstroms; but 3.02.
[Q] Yes.
And you could then calculate and you could explain all that.
[Q] It was split rather than curved.
Yes, they were split but then they... again, they were the Bessel functions on the... originally if it had been exact rational number; so I realised it was a non-integral number. And I think, you see, Bernal, still belonged to the old tradition where it had to be... you had to have integers. It's what threw... It's what threw... you know, the very famous fiasco... it's a related subject, where Perutz, Kendrew and Bragg tried to build chains of polypeptides.
[Q] Yes.
And they only used integer helices.
[Q] Yes.
Because that's what you had in the crystal, and that's interesting; that came from Bernal. Bernal, I used... Bernal used to come and ask me...
[Q] Yes.
And you may remember this... 'Why isn't it a three-fold screw axis?' And I used to tell him laboriously, 'Because if you look on the meridian you see there's a dip in the middle.' And you could see that on the... in the early pictures, but the old generation. So anyway, so I interpreted this; so, after that I began working with Rosalind... Franklin. And that was about then, so by that time, and we were publishing papers and she had done... And so she got some money from various people. Her work was being financed by the British Coal Producers' Association because she worked on graphite. But the X-ray tubes were all paid for, and on the side she was doing the Tobacco Mosaic Virus work. You see, Bernal's lab was full of people doing all sorts of odd things, you might call applied crystallography, and he spent time getting money from all of these things. Once the apparatus was in the lab we could use it on other projects. So in the early days Rosalind's work was...
[Q] She had a grant from the Agricultural...
Then she got a grant from the Agricultural Research Council to work on Tobacco Mosaic Virus. And when she got that grant she could hire assistance or PhD students, and so two people turned up John Finch and Kenneth Holmes.
