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Willis Haviland Carrier
Willis Haviland Carrier
invented an apparatus for treating air that provided cooling by controlling humidity. Now the central feature of what are now known as air conditioning systems, Carrier's apparatus was never called an air conditioner.
Arches
Arches
An arch is an opening spanned by a collection of wedge shaped pieces (voussoirs) which stay in position by pressing in on one another. An arch works because vertical weight is deflected into sideways thrust and transferred to the walls.
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This page was last updated on 05/28/2016.

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