Clock History Part two

The invention and innovation of the escapement was the next big piece in timekeeping history. In simple terms, the escapement allowed energy to be transferred from the energy element, to the time keeping element while allowing its movements or oscillations to be measured. This was important because if escapements did not exist, it would be nearly impossible to keep time mechanically.
      The earliest escapements were used in Greece in water clocks. a spoon supported by a counterweight would fill until it emptied into a basin. after so many cycles of this, a small round stone would be released. time could be measured based on how long it took the spoon to fill and empty, and a passerby could see the number of stones that were released (as they were kept neatly on a track for display, so it was known what time it was.) a method similar to this was used in the Tang dynasty in 725. This movement was based on a armillary sphere, which is a model of objects in the sky (plants, stars, etc). This was the first true clockwork escapement, but used for astrological purposes. it is suggested that this model of clockwork became the basics for the mechanical escapement, as well as the start of the European horology. Due to the fact that both of these sources utilize water instead of a mechanical source of energy, they are not true mechanical escapements, but the predecessor that made it possible.