Also it seems that there was at least one company making pneumatic master/slave clock systems for buildings. I've found references to these made by the Hahl company out of Chicago.
Not sure if any of these are still in service anywhere. I know pneumatic building automation systems are still actively in use today, I believe the office building where I work uses pneumatic thermostats for part of the HVAC control. -- Russell _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
