Islamic contribution to time keeping?

"A variety of mechanical clocks were produced by Spanish Muslim
engineers, both large and small, and this knowledge was transmitted to
Europe through Latin translations of Islamic books on mechanics. These
clocks were weight-driven. Designs and illustrations of epi-cyclic and
segmental gears were provided. One such clock included a mercury
escapement. The latter type was directly copied by Europeans during the
15th century. In addition, during the 9th century, Ibn Firnas of
Islamic Spain, according to Will Durant, invented a watch-like device
which kept accurate time. The Muslims also constructed a variety of
highly accurate astronomical clocks for use in their observatories."

quoted from: http://en.wikipedia.org/wiki/Clock

I am very much interested in learning more about the contribution of my
ancestor to the great history of timekeeping / watchmaking.

Can anyone help with additional conribution?

Appreciating your friendly assistance in advance.

.

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