Society of Glass Technology · [Sheffield] · leaf 340
o-o65 12 mm. to 18 mm. 14-285 14-3 + o-o15 17-46 17-45 + o-ot 17 mm. to 26 mm. 17-46 17-52 + o-o8 22-225 22-3 + o-o„ 23-81 23-9 + o-o8 The amount of wear is thus seen to be small, and if the instru-ments are checked occasionally, suitable corrections can be applied. When measuring the internal…
Glass
Internet Archive · Gerstein Library, University of Toronto · Public Domain Mark 1.0. Free to use for anything.
