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REGNAULT?S HYGROMETER SIMPLE
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For determining the dew point. Comprises a glass tube 150x25mm with polished silver thimble closed bottom of the tube & the upper end by a rubber bung. The bung has two glass air tubes with right angled bends. One tube ending just below the bung, the other reaching nearly to the bottom of the thimble & a hole for thermometer which reads 10 to 50?C x 0.5?C.
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