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.