Society of Glass Technology · [Sheffield] · leaf 611
ving tool, F, having been previously adjusted to the exactheight of the electrodes, D, the flask is centred in the holder, A,which is adjustable on the rod, G, this in turn being capable of 180 JOURNAL OF THE SOCIETY OF GLASS TECHNOLOGY. a rising or falling motion through the micrometer screw, B,… … Fig. 152. the circuit and lights the lamp, L. The best evidence of contactis said to be the distinct sound made by the bubbles of gas atthe moment they begin to be evolved. When this position isreached, the graving tool, F, is pushed forward and the wholesweep revolved, thus cutting a mark on the…
Glass
Internet Archive · Gerstein Library, University of Toronto · Public Domain Mark 1.0. Free to use for anything.
