
The glass bubble is on the pontil with the open end ready to be heated in the furnace. |

By turning the pontil a little faster as it heats up in the 2400º furnace, centrifugal force makes the bubble spin out to a flat plate. |

The finished form is allowed to cool slightly before the pontil is broken away so that the glass can be placed
in a 1000º kiln to cool slowly and anneal the glass. |