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They show streams and rivers, dams, aqueducts,
water towers, street fountains, and the public
institutions, mosques and palaces which had
their own water supply. Occasionally they illustrate
the houses of privileged individuals allowed
to have piped water, a mark of favour that was
granted only by imperial decree.
From ancient times into the sixteenth century
water was allowed to flow freely from fountains,
the water pouring out of stone gargoyles in
the form of plain spouts or carved animal heads.
But the expense of supplying water and its increasing
scarcity prompted the search for a convenient
way to control the flow, and so prevent this
valuable resource running to waste. For this
purpose an early type of tap known as a burma
lüle, in the form of a rod cut like a screw,
was developed. When twisted into the pipe these
screw taps cut off the flow. Their use commenced
during the reign of Süleyman the Magnificent,
but met with strong opposition from the water
carriers, as we see from an edict issued by
the sultan to the kadý of Istanbul asking
that measures be taken to prevent the vandalism
of taps.
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