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Examples of Horological
It might well be possible to set a date a few decades earlier, but in general as one proceeds backwards from this point, the evidence becomes increasingly fragmentary and uncertain.
If one is to establish a _terminus ante quem_ for the appearance of the mechanical clock in Europe, it would appear that 1364 is a most reasonable date.
I Hsiang Fa Yao," or "New Design for a (mechanized) Armillary (sphere) and (celestial) Globe," written by Su Sung in A.D. 1090.
Of the greatest significance, this stem reveals the crucial independent invention of a mechanical escapement, a feature not found in the European stem in spite of centuries of intensive historical research and effort.
At the same time there comes more evidence that the line of mathematical protoclocks had not been left unattended.
Closely associated with his book one also finds texts dealing with perpetual-motion devices, which we shall consider later.