| Titel |
Discussion of the Magnetic and Meteorological Observations: made at the Girard College Observatory, Philadelphia, in 1840, 1841, 1842, 1843, 1844, and 1845: Third Section, comprising parts VII, VIII, and IX Vertical Force: Investigation of the eleven (or ten) year period and of the disturbances of the vertical component of the magnetic force, and appendix on the magnetic effect of the Aurora Borealis; with an investigation of the solar diurnal variation, and of the annual inequality of the vertical force; and of the lunar effect on the vertical force, the inclination, and total force |