Fig, 6.—Washing oil Pumice. 39 enough to turn the glass red again, but not enoughto melt it. From thence on the heat gradually de-creases, until at the far end the glass comes out cold. This is a very important process, as a lack ofproper annealing will cause the glass to fly, orcrack, or go to… … Fig. 7.—Examining for Imperfections. At this stage the blank is somewhat rough onthe edges and varies in thickness from a sixteenth ofan inch up to a quarter of an inch, or perhaps more. The cutter now takes it in hand. First he roughsit out. Until recently a cutter would feel insulted ifhe were…
Pottery · Glass · Glassware
Internet Archive · University of Illinois Urbana-Champaign · Public Domain Mark 1.0. Free to use for anything.
![An illustration from [Catalog]. (1908)](https://img.insideoutlibrary.com/img/200/ia-catalog00macy-395-1105.webp)
