Society of Glass Technology · [Sheffield] · leaf 687
air, the pressure of which can be read by means of a suit-able mercury manometer. The diaphragm is sensitive to differences 28C JOURNAL OF THE SOCIETY OF GLASS TECHNOLOGY. in pressure between C and D, and a contact at A is provided tocomplete an electrical circuit containing a suitable indicator.… … >
Glass
Internet Archive · Gerstein Library, University of Toronto · Public Domain Mark 1.0. Free to use for anything.
