Abstract
Tracks of 270 MeV pions in a 10 cm hydrogen bubble chamber were measured with the CERN reprojection system (Iep). As a test of track distortion, the curvature of the parabola fitted to the points and the dispersion of these points were calculated. With flash delays of 1 and 2 ms the curvature in the middle region of the chamber was almost the same as that expected from multiple scattering showing that the convection currents which are used in the thermostatisation system, do not produce general distortions in the useful volume of the chamber.
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