====== Elementary clock ======
Under the term **elementary clock** all timepieces can be summarized that work by using one of the traditional four "basic elements". Include [[hourglass]]es, [[water clock]]s, [[fire clock]]s and [[sundial]]s to this group. In another sense, however, you can include all natural processes into this concept, which, through its cyclically recurring draining, allow an orientation within the category of time, eg the so-called [[bird watch]] and also the astronomical processes.


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