Society of Glass Technology · [Sheffield] · leaf 747
Fig. 242. 264 JOURNAL OF THE SOCIETY OF GLASS TECHNOLOGY. 369. Bevelling Lenses, etc. H. J. Birchall, Erdington(Brit. Pat. No. 135354. January 2nd, 1919, No. 30).—In agrinding machine for double bevelling the edges of eyeglass lenses,etc., in which two grinding-wheels are employed, one for… … or former mounted on a rotating shaft which carries the lens, etc.,the shaft is made in two parts, between the opposed ends, of whichthe lens is mounted, and means are provided whereby the axialposition of the former on the shaft can be adjusted relatively tothe thickness of the lens, so that the…
Glass
Internet Archive · Gerstein Library, University of Toronto · Public Domain Mark 1.0. Free to use for anything.
![An illustration from [Graphophone patents] (1878)](https://img.insideoutlibrary.com/img/200/ia-graphophonepaten15unit-77-62.webp)
