| Titel |
Discussion of the Magnetic and Meteorological Observations: made at the Girard College Observatory, Philadelphia, in 1840, 1841, 1842, 1843, 1844, and 1845: Fourth Section, comprising parts X, XI, and XII Dip and Total Force: Analysis of the disturbances of the dip and total force; Discussion of the solar diurnal variation and annual inequality of the dip and total force; and discussion of the absolute dip, with the final values for declination, dip and force between 1841 and 1845 |