rsync through intermediate server

[Jerry Neely]

We have a number of scripts that use rsync to automate administration 
of a number our servers.  We are adding servers that are not directly 
network accessible to our main admin box.  That is, we have to go 
through an intermediate machine to reach these new machines.  I've 
seen how you can string ssh commands together to copy commands 
through an intermediate machine.  Does anyone know of a way to do 
something similar with rsync?  That is, how can I rsync files to/from 
machine A to C through machine B without having to perform an 
intermediate step on B?

Thanks for any help you can offer.

Jerry
--
Jerry Neely
jneely at pobox.com