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EXPERIMENT 7: Build an Air Cooler |
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| THINGS YOU NEED: A 6-foot length of “two-by-two”
wood stock (the kind lumber yards sell as wall studding). A few wood screws or wood glue. A narrow
metal loaf cake pan. Some cheesecloth. A few thumbtacks. |
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| One of Lewis Latimer’s simpler inventions is an “apparatus for cooling and disinfecting” room air. It works on a familiar scientific principle: When water evaporates, it absorbs heat. |
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| Latimer’s original patent drawing shows a wooden
frame that supports a cloth screen. A small tank atop the
frame is filled with water. The upper edge of the screen
rests in the tank, and water “wicks” down to dampen the
whole screen.
As air moves through the screen, the water evaporates |
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