Barometer mechanism

A barometer mechanism comprising, in combination, a base, a bellows having a pair of opposed co-extensive walls joined about their peripheries to form a sealed chamber and one of said walls rigidly mounted on said base whereby changes in ambient air pressure result in movement of the second wall towards and away from the mounted wall, a compound lever comprising a pair of simple levers operably contacting said movable second wall for transmitting and amplifying movement of said second wall as substantially linear motion remote from said second wall, a spindle journalled on a first of said simple levers for rotation, a helical spring concentric with and mounted on said spindle adapted to bias said spindle in a first direction of rotation, flexible connecting means secured to and wrapped about said spindle in a direction opposite to the said first direction of rotation and connected to the second of said simple levers, whereby bias of said helical spring on said spindle tensions the flexible connecting means and maintains the first of said simple levers through said second lever in continuous abutment against the movable wall of the bellows for sensing changes in ambient air pressure and transmitting changes in pressure to the spindle for rotation thereof.