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To ascertain correctly by actual observation the amount of atmospherical refraction at low altitudes and at various states of the barometer and thermometer, is a problem which has long occupied the attention of practical astronomers; and many elaborate theories have also been given to explain the anomalies which have hitherto attended the most careful observations.

IX. Observations to determine the amount of atmospherical refraction at Port Bowen in the Years 1824-25.