Drop in Impedance of Gun Coils
When Projectile Enters Them
(Reproduced from "Zero to Eighty" pp.330-331 by EF Northrup)
The experimental data given here (see chart below) apply only to the
particular case studied.
The drop in impedance is a function of
the closeness of coupling (mutual inductance),
he resistance of the coils in circuit,
the frequency of the current, and
the ratio of the secondary resistance and reactance.
The data are accurate for the particular case considered, but
are only suggestive of what the dimunition in coil impedance would
be in other cases, under other conditions.
Terminal impedance changes in a coil at 2000 cycles
Sketch of experimental set up in connection with taveling wave development