16 February 1953
Dr. Gerald Oster
Polytechnic Institute of Brooklyn
99 Livingston Street
Brooklyn 2, New York
Dear Dr. Oster:
Thanks for your letter of 3 February.
The point that you raise - that you do not feel that the equatorial spacings will be markedly altered whether one assumes
seven parallel rods or six rods twisted around a central rod — is an interesting one. I would be inclined to agree with
you, except for a contradictory fact. Crick has written that our expression is the first term in the complete expression
for the seven-strand helical cable, which he has evaluated, and, since our expression differs from yours, the two approximate
form factors do seem to be different.
I am interested to learn about the work that you are carrying on.