Some physical properties of a large number of window glass specimens.

In forensic science laboratories it is frequently necessary to compare the properties of glass fragments and excellent methods are available for determination of their refractive index and density. Following a comparison of glass fragments which prove to have similar physical properties it is often helpful to assess the frequency of their occurrence in relation to other glasses. However, there has been little work published [1–3] showing the refractive index or density distributions of window glasses in England and Wales.