Society of Glass Technology · [Sheffield] · leaf 241
9 9 n—rr~M Fig. 4. … RECENT IMrilOVEMENTS IN CLASS EURNACES. 153 grate producers, and the expenditure on upkeep is high. Forthis reason many users have returned to the more simple non-mechanical types. In order to approach as nearly as possible to the theoreticallyperfect producer, three primary conditions are…
Glass
Internet Archive · Gerstein Library, University of Toronto · Public Domain Mark 1.0. Free to use for anything.
