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.