Publisher's Synopsis
Excerpt from Discussion of the Magnetic and Meteorological Observations Made at the Girard College Observatory, Philadelphia, in 1840, 1841, 1842, 1843, 1844, and 1845, Vol. 2: Investigation of the Solar Diurnal Variation in the Magnetic Declination and Its Annual Inequality
The mean given is the simple mean of the four readings, and at 14h of five readings, and is here inserted for comparison with the corrected mean in the line below, which would have been obtained if there had been no emis sions in the observations.
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