In their original form and shape one-handed clocks and watches are shadow-rods as found in sundials, which have already been mentioned from the fourth century BC. In a one-handed timepiece the reading on gauges is applied as done with measuring instruments, because the display of time is reduced to the essential, i.e. to time itself. GNOMONIK has got a very fine subdivision between the quarterly sections of its face. This makes it possible to read the time exact to the minute.