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The Challenge: Build accurate clocks, construct a timepiece that chimes and make a portable 'watch'

To tell the time in a Rough Science environment — where we only have access to a tool kit, rope, buckets, hoses and old scrap — it is probably easiest to use the sun, a local ingredient which was thankfully in plentiful supply. The one point that is relatively easy to determine by using a sundial is local noon. But how do we make the sundial tell the time accurately, how do we get a clock to chime, and with the rough components on the island, how will we ever make a wristwatch?