In particular, item 2-37 begins "Reading a
ferrite-core memory
destroys the information in the memory." It then goes on to describe
the restore part of a read operation. No mention of "core rope" is
made. The document, all 200-some pages contains a great deal of
detail on the computer, including memory operation and organization.
What about a magnetic ressonance machine, without the electromagnets?
Couldn't it create a tridimensional map of actual magnetic orientations?