Compressed air is delivered to nipple a from where a part passes into membrane unit 1 and the remainder is discharged through nozzle d. In measuring vertical acceleration, sensing element 2 turns together with lever 3 about fixed axis A. This turns plate 4 about fixed axis B, bringing it nearer to or retracting it from nozzle d. The pressure in membrane unit 1, connected by nipple b to a pressure gauge, depends upon the position of plate 4 with respect to nozzle d. Thus, the pressure in membrane unit 1 depends upon the vertical acceleration being measured. Motion is transmitted from membrane 7 to lever 3 through link 6, connected by turning pairs C and D to membrane 7 and to lever 3. Motion is transmitted from lever 3 to plate 4 through link 8, connected by turninig pairs E and F to plate 4 and to lever 3. The pressure is indicated by a pressure gauge graduated in units of acceleration. Natural vibrations of the system are damped by air damper 5, consisting of piston 9 and link 10 which is connected by turning pairs K and M to piston 9 and to lever 3.
$4072$EHP,M$