The tandem accelerator began operation at Chalk River in February 1959 and the total fraction of operating time in the 18 month period since then has been about 80%. The installation and major experimental apparatus is described and a brief summary of the experimental program is given. This is followed by a more detailed description of two aspects of this program. The first concerns the interaction between beams of heavy ions such as C 12, N 14 and O 16 with targets of nitrogen, oxygen, fluorine, neon, magnesium, aluminium and silicon. In this investigation narrow resonance structure was observed in the C 12 + C 12 reaction. The second concerns measurements of spins of levels in even-even nuclei lying between O 16 and Ca 40. A particle in, particle out-reaction such as inelastic proton scattering is employed to excite the levels and gamma-gamma correlations are measured in different geometries. The spins of 18 levels have been assigned to date.