Hahl Pneumatic Master Clock

This Blog follows my restoration of a Hahl Pneumatic Master Clock.

If you have a Hahl clock or parts for a Hahl clock please email me at stotlarj@gmail.com.

Hahl made Pneumatic master clocks that in turn ran slave clocks throughout schools, factories, office buildings, etc.

The clock compresses or expands one or two bellows every minute. This change in pressure would cause all slave clocks to advance one minute.

This particular clock came from the Mentor High School in Mentor, Ohio.

This clock would have operated the slave clocks in the school and it would have also operated the bells for class periods. The bell program unit is the cylindrical unit below the clock.

I obtained it locally from a lady who has owned it for years. it was in very bad shape when I picked it up.

Clicking on pictures will enlarge them.