Invented by Henry S. Parmelee in the late 19th century, the Calculagraph was designed to print the start and end times of a telephone call or a manufacturing process directly onto a time card. Unlike a chronograph that uses a sweeping hand, a Calculagraph uses a complex series of cams and levers to move a typewheel.
Treat your CAL6B with respect, keep it clean, and it will measure time long after your digital devices have turned to e-waste. Do you have a specific serial number or a photo of your CAL6B's movement? Professional restoration services are available via the American Watchmakers-Clockmakers Institute (AWCI). cal6b calculagraph manual
While a is nearly impossible to find in a glovebox, the knowledge shared above—compiled from service bulletins, collector forums, and restoration guides—should give you the confidence to operate, repair, and appreciate your machine. Invented by Henry S