A description is given of a chamber used for studying the angular distribution of scattering of neutrons by helium. This counter can be used either as an ionization chamber or as a proportional counter. Results of tests made with theN(n, p) reaction for slow neutrons are included. These tests show a width of the 0.6‐Mev line at half‐height to be about 35 kev, indicating that it should be possible to separate low energy neutron groups which differ in energy by about 50 kev.