| 摘要 |
PURPOSE:To enable it to indicate each local time while a world map is drawn on the other half of an indication panel to mark a time indication area by setting up a circuit for putting out simultaneously the local times of plurality of areas with the fixed differences in time. CONSTITUTION:The commercial power source 1 is pulsed through a pulse forming circuit 2 to be put in a Hz discrimination circuit 3 for discriminating its frequency and then to be conducted to the counting circuits 4, 5, 6 followed by making 24 times a1-a24 having every one hour difference from a time differential setting circuit 7 to be put out. On the back of one half of the clock panel 11 a required number of time indication tubes 12a-12d are equipped, which can be seen through a transparent part of the clock panel 11, while on another half part of the panel 11 the world map 13 is drawn, the cities, each of which local time is to be indicated, are given printed the suitable indication marks 14 respectively and out of the outputs a1-a24 a local time corresponding to each city is picked out to be indicated on the time indication tubes 12a-12d. |
