Az idő mérése (E04)

This time, we’re taking a closer look on the history of the clock – from the sundial to the atomic and quartz clock. It all began with the sundial. The disadvantage of that one was that it couldn’t work at night. That’s when the idea of a water meter was developed. Also sand showed itself to be suitable for measuring time. Charlemagne was owner of the largest hourglass of the world. Only after 12 hours it needed to be turned around again, and to do so, it took some rather strong men. Furthermore, candle clocks, oil clocks and clepsydras were still in use, which had been perfectly developed by the Chinese. (iTunes)