Society of Glass Technology · [Sheffield] · leaf 177
ly measured at a number of points; the dia-meters varied a little from point to point, but a sufficiently closemean covild be taken. The measurement of the thickness of bothpot-bottoms and rods after attack was a more difficult matter. Inthe first place, they could not be freed from adhering glass,… … Fig. 2.
Glass
Internet Archive · Gerstein Library, University of Toronto · Public Domain Mark 1.0. Free to use for anything.
