Answers

2015-07-18T09:06:57+05:30
A leaking tap cannot be used for measurement of time

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2015-07-18T09:10:11+05:30
"A leaking tap" is the answer because we cannot estimate when will the drop fall.
where as
⇒ simple pendulum shows time by its to and fro motion.
⇒ in olden days  the time is estimated by the shadow of an object
⇒ blinking of eyes is rarely seen which blinks by time unless by reflex actions
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