The arrangement of atoms in crystalline solids is relatively easy to study and understand, because the atoms are arranged in layers. On the other hand, glasses, in which the atoms are not arranged in a crystalline fashion, are much more challenging to study and understand. In glasses, the atoms are arranged in a random network, and sodium silicates are the key glass system that underlies this concept. Neutron diffraction is one of the most useful probes of glass structure, and yet it has only been applied to sodium silicate glasses to a limited extent, due to difficulty of interpretation. We have perfected a method of overcoming this difficulty and we seek to perform a wide-ranging study of the structure of sodium silicate glasses to investigate a number of topics of current interest, including the environment of the sodium cations and the presence of free oxygen.