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Most National Trust houses have at least a barometer and some have considerable collections of early scientific instruments like the 18th-century orrery and telescope at Dunham Massey.
Country House technology is represented by gas, electric and hydraulic installations within or directly connected to historic houses.
Of outstanding interest is the first domestic hydroelectric plant installed by Lord Armstrong at Cragside.
At Castle Drogo electricity is brought into the Switch room from two turbines on the River Teign.
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