Abstract
The physical characteristics of transparent bodies capable of resisting stress have been the subject of much investigation, and in particular the properties of various glasses have been studied with much thoroughness since these latter have an extensive use both for commercial and scientific purposes. In recent years many new forms of optical materials have found an industrial use, and especially nitro-cellulose compounds, which are valuable in cases where glass is not suitable. In recent years many new forms of optical materials have found an industrial use and especially nitro-cellulose compounds, which are valuable in cases where glass is not suitable.

This publication has 0 references indexed in Scilit: