tt We have studied electron pair photoproduction in the field of the nucleus and in the field of the atomic electrons of neon. A streamer chamber which in many ways behaves as a bubble chamber has been used for this experiment. The recoiling electron is observed and its momentum deduced from its curva-ture in a magnetic field. Most results agree with theory, in particular the tri-plet cross section, although the momentum distribution of the recoiling electron seems to fall more rapidly than expected. We also report the results of several tests that have been made in order to determine the usefulness of streamer chambers with incident electron and photon beams. (To be submitted to The Physical Review) *Work supported by the U. S. Atomic Energy Commission “f Now at Laboratoire de l*AccQl&ateur Lineaire, Orsay, Franc
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