Calendar: 1864-1865 Page 300

3C0 EVENING CLASSES III Magnetism of the Earth Determination of its Direction and Intensity at different places The Declinometer The Dipping Needle The Magnet- ometer Magnetic Charts The Work of Magnetic Observatory Photographic Registration of the Magnetic Elements Magnetic Storms and Sudden Disturbances The Diurnal and Annual Variations The Secular Variation IV Magnetism of Iron Ships Errors of the Compass Methods of Correction Magnetic Induction Electrical Attractions and Repulsions Transference of Electricity Conductors and Insulators Mea- surement of Quantities of Electricity by the Statical Method VI Electrical Induction The Leyden Jar Electricity produced by Work The Electrophorus Varley's Condenser Electric Potential Electric Capacity Electroscopes and Electrometers Atmospheric Electricity VII Electricity in Motion The Electric Current Relation to Statical Electricity to Chemical Action to Magnetism Oersted's discovery of the Mechan- ical Action between Current and Magnet Ampere's Laws of the Mutual Action between Currents Faraday's Discovery of the Production of Currents by Magnets and by other Currents VIII On the Electro-magnetic System of Measurement Measurement of Currents Tangent Galvanometer Weber's Electro-Dynamometer IX Ohm's Law for the strength of Currents Derived Currents Wheatstone's Bridge Comparison of resistances by the Electric Balance Method of finding the position of fault in Submarine Telegraph Cable Siemens' Thermometer for deep- sea soundings