Quarter sawn oak case. Movement signed 'Hahl Automatic Clock Co. Chicago'. Patented January 25, 1898, December 1, 1908, January 1909. Other patents pending. In 1877 the Hahl Clockpany, Chicago, Illinois, introduced the first pneumatic operated master clock system. The pendulum-driven master clock system needed no electrical current to control the remote (slave) clocks. This master clock ran the slaves by pumping air through lines to the slave clocks. The clock does include a ctom base which allows the clock to run 7 days and stands at 8 ft. tall.Dimensions: Max Ht. 7 ft. 5 1/2 in. W 24 1/2 D 17 inProvenance: From the private collection of the Calculagraph Co. East Hanover, New Jersey and the proceeding three generations.