Society of Glass Technology · [Sheffield] · leaf 539
ended with itslower end a few inches above thesurface of the metal, 2. Withinthe tube, 13, a fan, 19, operatedby a motor, 16, sucks air down-wards, so that there is a completeair circuit within the cylinderbeing drawn. A centring device,23, which opens and close® like anumbrella, bears lightly…
Glass
Internet Archive · Gerstein Library, University of Toronto · Public Domain Mark 1.0. Free to use for anything.
