Day 27: Altimeter
Jonathan and I helped Kathy collect black sand, which we assume
has tiny gold flakes in it, from a beach. It was almost disastrously
funny though. When we hit the beach, we quickly found it covered
in pebbles and rocks. As it turns out, the weather changed last
night and what is normally a black sand beach with some rock and
gravel became a pebble beach. Thankfully, we were able to find two
good patches of black sand far down the beach. I was amazed that
our plastic buckets didn't fall apart under the weight.
sand is high in iron which is dense, thus it is heavy per unit size.
Most, if not all, white sand is made of silica which is not so dense,
thus is not so heavy per unit size.
we helped Kathy, Jonathan and I got on with our discussions about
how to measure change in altitude in order to retrieve the treasure.
As it turns out, the map we received was a bit misleading, so we
asked for another one! We should have an updated version tomorrow
so that we can build a useful altimeter using the same equipment
one would use to make a barometer. The basic difference between
the two is that a barometer is stationary and is designed to measure
pressure changes that occur as weather changes. With the kind of
altimeter we're making, we need the weather to stay constant so
we can measure the natural changes in pressure as altitude changes.
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