A nephelescope is a device invented by James Pollard Espy to measure the drop in temperature of a gas from a reduction in pressure; originally used to explore the formation of clouds. == Original design == The original design consisted of an air compression pump (a), a vessel (b), and a barometer (c). Air is pumped into the vessel until a desired ...
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nephelescope An instrument for viewing the upper strata of clouds.
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