Jet diameter was measured as a function of distance from
the apex of the cone by laser light diffraction, at a constant
tip potential and screen position. In Figure 4, a plot of jet
diameter as a function of distance from the tip of the cone
for 4 % by weight concentration PE0 solution spun at 10
kV is shown. The distance between the capillary tip and the
metal screen was set to 25 cm. The jet diameter was
observed to decrease with increasing distance. The jet
diameter decreased by about a factor of 5 at a distance of 10
mm from the tip of the cone, indicating a large amount of
stretching. The jet diameter was not measured beyond
about 30 mm because the jet become too small and unsteady
at greater distances.