[sdiy] Bubble memory analog delay?

[cheater00 .]

Hi,
I was wondering if anyone came across either garnet or twistor based
bubble memories used as delay lines.

Check the info here:
http://en.wikipedia.org/wiki/Bubble_memory

"
One interesting side-effect of the twistor concept was noticed in
production; under certain conditions, passing a current through one of
the electrical wires running inside the tape would cause the magnetic
fields on the tape to move in the direction of the current. If used
properly, it allowed the stored bits to be pushed down the tape and
pop off the end, forming a type of delay line memory, but one where
the propagation of the fields was under computer control, as opposed
to automatically advancing at a set rate defined by the materials
used.
"

"
[A] pattern of tiny magnetic bars [was imprinted] onto the surface of
the garnet. When a small magnetic field was applied, they would become
magnetized, and the bubbles would "stick" to one end. By then
reversing the field they would be attracted to the far end, moving
down the surface. Another reversal would pop them off the end of the
bar to the next bar in the line.

A memory device is formed by lining up tiny electromagnets at one end
with detectors at the other end. Bubbles written in would be slowly
pushed to the other, forming a sheet of twistors lined up beside each
other. Attaching the output from the detector back to the
electromagnets turns the sheet into a series of loops, which can hold
the information as long as needed.
"

I'm sure just like with tape drives not only "0" and "1" could be
stored but any voltage inbetween.

Cheers,
D.