Cooling the Filter Barrel.
[Illustration: Fig. 260. The Water Wheel in Action.]
The trough line was very leaky and a great deal of water splashed out of
the buckets. But for all that, within a few moments our barrel was full
and overflowing. We hadn't figured on its filling so rapidly, but we soon
found a way of utilizing the surplus water. It was led to a half-barrel in
which we washed our dishes, and from there it flowed through a ditch back
to the river. The water for the wash barrel was taken from the top of the
upper filter barrel. But we let the lower filter barrel flow over so that
it would be kept wet on the outside. Our filter was fortunately placed at
a point where a good breeze struck it, and we shoveled away the earth that
had been piled around it so that the wind playing on the wet barrel
evaporated the moisture, making the water inside very cool.
The Canvas Bucket.
This same trick was used for cooling our drinking water whenever we went
off on an expedition away from camp. We had a heavy canvas bucket, the
kind used on ships. We would fill this bucket with water and then hang it
up in the wind. The water seeping out of the pores of the bucket would be
evaporated by the wind, and this would, in a few moments, make the water
inside delightfully cool.
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