Society of Glass Technology · [Sheffield] · leaf 637
g level in the melting tank, 1, by means of a valve, 14,which is operated through levers, etc., from a pivoted float, 4. Another device by the same inventors (Brit. Pat., No. 174097,July 13th, 1920) relates to the delivery of uniform charges of moltenglass from a tank furnace and consists in…
Glass
Internet Archive · Gerstein Library, University of Toronto · Public Domain Mark 1.0. Free to use for anything.
