CHAPTER XV. GALVANIC CELLS AND BATTERIES 102

Exp. 108, To study the effect of dilute sulphuric acid upon carbon and various metals.--To amalgamate.--Dilute sulphuric acid.--Discussion.--Exp. 109, To study the effect of dilute sulphuric acid upon various combinations of metals.--Discussion.--Exp. 110, To study the construction of a simple Voltaic or Galvanic cell.--The Electric Current.--Source of the Electrification.--The Electric Circuit; Open and Closed Circuits.--Plates or Elements.--Direction of Current.--Poles or Electrodes.--Chemical Action in the Simple Galvanic Cell.--Action in Cell Using Impure Zinc; Action Using Pure Zinc.--Exp. 111, To see what is meant by "local currents" in the cell.--Local Action; Local Currents.--Reasons for Amalgamating Zinc Plates.--Exp. 112, To study the "single-fluid" Galvanic Cell.--The Simple Cell.--Polarization of Cells.--Effects of Polarization.--Remedies for Polarization; Depolarizers.--Exp. 113, To study the "two-fluid" Galvanic Cell.--Setting Up the Two-Fluid Cell.--Care of Two-Fluid Cell.--Copper Sulphate Solution.--Chemical Action in the Two-Fluid Cell.--Various Galvanic Cells; Open and Closed Circuit Cells.--The Leclanché Cell--Dry Cells.--The Bichromate of Potash Cell.--The Daniell Cell.--The Gravity Cell.