| 摘要 |
Watch (10) has rotational watch mechanism (28), flat dial (12) and indicator. Knob (22) switches on light source, diode (24), kept under lid (26). Lid has 3 apertures (32) with always one projecting light beam (34). Beam is projected to plan parallel to dial with trace visible on dial (12). Mechanism makes diode rotate so as to scan angular zone of dial with radial markings (14) as on sundial. |
