Letter from Rosalind Franklin to Donald L. D. Caspar
Biophysicist Donald Caspar had recently finished his doctoral work on TMV structure, and had contacted Franklin at James Watson's
suggestion. In this letter she expressed her interest in his results and discusses her own work briefly. Caspar worked with
Franklin's team during the 1955-56 year, helping them determine the configuration of TMV.
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1954-11-08 (November 8, 1954)
Caspar, Donald L. D.
Yale University. Sloane Physics Laboratory
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.
Thank you very much for your letter. I am very interested in your results.
I have calculated Fourier projections from the equatorial data, in very much the same way as you (using the theoretical shape
of the central peak) and I find a heavy density shell at about r = 55A. My intensity measurements are undoubtedly less accurate
than yours, but they extend to much larger angles, which enabled me to calculate a complete projection rather than its difference
from a uniform rod.
I am at present busy writing up this and other aspects of the work and hope to be able to send you a copy of a draft paper
in a week or two.