Robley Williams was one of many virus researchers that Franklin visited during her 1954 trip to the United States. He had
written to her about her recent article on the probable structural configuration of TMV, as revealed by x-ray diffraction
studies, and mused about the differences between her data and those found by he and his colleagues via different methods;
they continued to brainstorm about this in a series of letters.
Number of Image Pages:
1 (45,593 Bytes)
1955-07-12 (July 12, 1955)
University of California, Berkeley
Original Repository: Churchill Archives Centre. The Papers of Rosalind Franklin
Reproduced from the Franklin Collection at the Churchill Archives Centre with the permission of the copyright holder.
I am sending you, under separate cover, copies of papers on various aspects of GMC structure, and I should be grateful if
you would pass them on to anyone else at Berkeley who might be interested. One of them is entirely concerned with the shape
of the TMV particle. The conclusion that the 1/2 depth of the helical groove is about 15 A, 75 A being the mean radius, agrees
reasonably well with Caspar's conclusion that the radius of TMV is 84 A.
The density of remains puzzling, and is made slightly worse by the Caspar and Watson idea of a hole down the middle, even
when RNA is present.