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A unique system of clocks designed by Charles Rennie Mackintosh has been reinstated in Glasgow School of Art.

The 19 distinctive square studio clocks are linked to a master clock which should send an electrical pulse ensuring they all show the same time.

The clock system, designed and installed by Mackintosh in 1910, was a rare and important technical innovation.

Unlike conventional clocks of the time, the "master and slave" clock system did not need winding and the whole system was low maintenance.