, C l decays for particles up to 35 GeV/c would be seen, and the intermediate spectrometer could be eliminated (see Summer Study Report A. 3-63-13). Secondaries could be traced far enough to simplify their identification in the high-momentum spectrometer. Troubles At the present time, streamer chambers have problems. Steeply dipping tracks tend to flash and obscure their region of the chamber. The light level is so low that wide -aperture lenses and fast, grainy film has to be used. The resultant images are not of sufficient quality to be measured on contemporary automatic measuring machines. Neutral -Pion Detection A significant advantage of the streamer chambers over the bubble chamber is that the thin walls make it possible to get the photons from r