Society of Glass Technology · [Sheffield] · leaf 733
ing clamp for the upper end of the object comprises aconical buffer, 18, rotatably mounted at 21 on a rod, 19, slidablymounted in a bracket, 24, adjustably fixed by a screw, 27, on apost, 26. A lever, 31, is provided for lifting the rod, 19, andbuffer, 18, which are pressed downwards by a spring,… … Fig. 221. shown at 67 (Fig. 222), each comprise a pointed tube, 67, having ;a ball valve closed by a spring, 46, and opened when the pencil ispressed against the object, 22, by a needle point, 47, on the ballprojecting through the nozzle or opening. For marking lines invertical planes, a pencil,…
Glass
Internet Archive · Gerstein Library, University of Toronto · Public Domain Mark 1.0. Free to use for anything.
