Bellows 1 and 2 are rigidly attached together by means of hollow cylinder a. The air is evacuated from bellows 1, and bellows 2 is connected by tube d to the space in which the pressure is to be measured. As bellows 2 is deformed by the pressure, link 3, attached to bellows 2, is displaced. Link 3 is connected by turning pair A to slider 4 which slides along the axis of link 5, turning about fixed axis B. Connecting rod 6 is connected by turning pairs C and D to links 5 and 7. Link 7 turns about fixed axis E and has segment gear f which meshes with pinion 8, turning about fixed axis F. The readings of the gauge are indicated by hand b, rigidly attached to pinion 8, on scale 9. Weight P counterbalances the weight of link 5.
$4059$EHP,M$