First progress report on a multi-channel magnetic drum inner ...

VI-
the 3 mil head 30 amperes is required to develop the same output
voltage. Furthermore, under these circumstcinces the 1 mil wire
records 90 pulses per inch while the 3 mil wire records only 50
pulses per inch. It should be noted from Table IV that 5 amperes
through the 1 mil head records 120 pulses per inch. This figure
must be discounted, however, since the output amplitude is not only
low but also is very sensitive to variations in recording current,
presumably because the medium is not saturated with a 5 ampere
recording current.
5