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Two heritage-listed cranes are rendered humidity
and temperature sensitive. Each crane holds aloft (on its pulley wire) a set of
switched, weather-responsive coloured indicator lights. One of these sets of
lights responds to temperature, and the other to relative humidity. The lights
range in colour from blue at the top of the chain, through green and amber, to
red at the bottom. Switching controllers, custom-built for this project, are
installed in the crane cabs. In conditions of extreme heat and humidity, the
colour of the cab interiors also deepens.
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