Society of Glass Technology · [Sheffield] · leaf 741
liminary heating, the head moves on to position 60, where threeflames, 61, 62, and 63, heat a narrow band of the neck of the bulb.The final heating takes place at position 65, where six burnerscause the constricted portion of the neck to collapse and becomesealed to the flared portion of the stem,… … Fig. 187.
Glass
Internet Archive · Gerstein Library, University of Toronto · Public Domain Mark 1.0. Free to use for anything.
