Discussion of the Magnetic and Meteorological Observations, Vol. 1: Made at the Girard College Observatory, Philadelphia, in 1840, 1841, 1842, 1843, 1844, and 1845; Investigation of the Eleven Year Period in the Amplitude of the Solar Diurnal Variation an: Made at the Girard College Observatory, Philadelphia, in 1840, 1841, 1842, 1843, 1844, and 1845; Investigation of the Eleven Year Period in the Amplitude of the Solar Diurnal Variation an
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Discussion of the Magnetic and Meteorological Observations, Vol. 1: Made at the Girard College Observatory, Philadelphia, in 1840, 1841, 1842, 1843, 1844, and 1845; Investigation of the Eleven Year Period in the Amplitude of the Solar Diurnal Variation an: Made at the Girard College Observatory, Philadelphia, in 1840, 1841, 1842, 1843, 1844, and 1845; Investigation of the Eleven Year Period in the Amplitude of the Solar Diurnal Variation an
