Each of the four membrane boxes 1, connected to one another in series, contains spring 2 whose purpose is to ensure proportionality of the barograph scale. Upon a change in atmospheric pressure the whole system of boxes is deformed and this motion is transmitted by pin 3 to link 4, which is connected to link 3 by turning pair B and turns about fixed axis A. Connecting rod 5 is connected by turning pairs C and D to link 4 and to link 6 which turns about fixed axis E. Rigidly attached to link 6 is hand 7 which indicates the readings of the barograph on scale a and carries a pen that registers the readings on a paper chart wound on rotating drum 8.
$4061$EHP,M$