Bottle Ready To Be Cut In Two
Fig. 89. Heating The Bottle
Rough edges of glass can be ground smooth by means of emery paper. For example, to smooth the edges of the glass bottle you have just cut in two, use the file for the rough work, then lay a piece of emery paper on a plate of glass, emery side up, pour a little kerosene on it and rub the rough surface on the emery with a rotary motion (Fig. 91).
Fig. 90. The bottle cut in two
Fig. 91. Smoothing the edges
Finish with fine emery paper, and smooth the edges inside and out with the fine paper.