LEVER MECHANISM OF A RATE-OF-CLIMB INDICATOR

Vessel 1 is connected to membrane box 2 and also to the atmosphere through capillary tube 3. Depending upon the vertical velocity of the item on which the instrument is mounted, the pressure inside and outside membrane box 2 differs due to the retarded flow of air through the narrow passage in capillary tube 3. This deforms membrane box 2 and its motion is transmitted to shaft 10 to which hand 4 i…