The Li6(n,d)He5 reaction was to be investigated with bombardment by 15 Mev. neutrons. This entailed the detection of low energy (about 6 Mev.)deuterons in the presence of high energy (15-17 Mev,) background, The related detection of low energy neutron groups from (d*n) reactions was also scheduled. The spectrometer used by Eisser, Price, and Glass, and improved by W. L. Anderson was to be employed in the experiments, Before this purpose could be realized, however, several problems left unresolved by Anderson had to be studied further, the major one of which was that of the central wire size* This problem involved consideration of ion movement, ion collection, and gas amplification. The present work attempts to treat these problems and gives the experimental determination of some of the factors involved, plus the results of investigations of the background counting rate. The work on the Li6(n,d)He5 reaction consisted of angular distribution measurements at different neutron energies, and was done in collaboration with Mr. R.L. Steele.