The trapped particle pinch effect (Ware's drift) has been observed in a non
-neutral plasma of electrons in a modified Malmbeg-Penning trap in which el
ectrons are contained in the annular volume between concentric cylinders. A
pulsed azimuthal electric field is applied by increasing the flux within a
solenoid on the axis. Radial displacements of the electrons are observed w
hich show that they remain on a surface enclosing constant axial Bur. These
displacements are independent of the azimuthal field and thus are consiste
nt with Ware's drift and inconsistent with the guiding center drift alone.