CONTENTS
CONTENTS
Discovery, Naming and Classification. Where Found and Method of Extraction. Three Forms, Amorphous, Vitreous and Metallic.
Factors in Design. Bildwell Cell. Application of Selenium and Annealing. Ruhmer Cell. Bell and Taintor Cell. Mercadier Cell. Gripenberg Cell. Theory of Operation.
Description of Hot Press. Accessories for Press. Other Apparatus Required and Supplies. Preparing Copper Plate. Applying Selenium. Treating in Hot Press. Application of Gold Foil. Assembling Cell.
Two States. Testing and Maturing Set. Accessories for Set. Construction of Rheostat Arm for Wheatstone Bridge. Measurement of Cells by Bridge Method. Tests for Light Sensitiveness. Proper Voltage. Classification of Cells. Testing for Polarization. Treating with A. C. Raising Resistance of Cells. Testing for Current Generation. Reconstruction of Useless Cells. Measurement of Cells by Substitution Method. Sealing Cells.
Photometric Applications. Transmission of Speech Over Beams of Light. Automatic Control of Light Buoys and Isolated Lights. As Recorder of Sunlight. Astronomical Applications. Talking Pictures. The Phonoptican, How the Blind May Read by Sound. Controlling Mechanisms at a Distance. Electric Dog. Use in Cable Telegraphy. Burglar Alarm. Selenium Batteries, Current Generators. Telephonic Properties. Effect of Different Current Sources on Sensitiveness of Cells.