First neutrino event in a hydrogen bubble chamber was found on Friday the13th of November on film taken with the Argonne 12-foot chamber. A neutrinocoming from the left interacted with a proton to produce the three-prongedevent consisting of μ−(longest track), a proton (shortest track) and a&pgr;+. Neutrino-proton interactions had previously been observed in a propanechamber at CERN, but not in a hydrogen chamber. Both Argonne and Brookhaven, which has a 7-foot chamber, are preparingto start long runs to measure neutrino-nucleon interactions. Neither deviceis completely shaken down yet, though. Argonne will have neutrino beams of0.5-1.5 GeV/c, and Brookhaven will have one that peaks at 2-3 GeV/c.The Argonne chamber will continue to run with hydrogen during an initial exposureof about 500 000 pictures. Based on the success of this running, thechamber will then be scheduled for a deuterium filling and an additional onemillion pictures. This later run will study the axial vector form factor in theweak interaction, as will the Brookhaven run, which will start with 300 000pictures in deuterium; 700 000 pictures more are proposed for a later run.