Selenium cells

=The Fritts Cell=, as mentioned by the inventor, when first made has one of two states or conditions. In one the resistance is very high, in the other very low, being but a few...

=A selenium cell= consists essentially of two electrodes of brass or copper bridged by a thin layer of metallic selenium. When connected into a circuit with batteries and other...

To go into a detailed description of the many applications of selenium cells is not possible in a work of the size of this. However a discussion of the manifold applications wil...

The secret of the successful construction of the Fritts selenium cell lies entirely in the method of applying the selenium to the copper plate. The selenium is melted on the pla...

Over a century ago, 1817 to be exact, the Swedish scientist Berzelius discovered a new element in the lead chambers used for the manufacture of sulphuric acid by roasting iron p...

A selenium cell will give much better service and have a longer life if a little care is taken with it. These suggestions if followed will prevent to a great extent irreparable...

FIG. PAGE 1. Bildwell Cell 7 2. Ruhmer Cell 10 3. Bell and Taintor Cell 12 4. Mercadier Cell 14 5. Gripenberg Cell 15 6. Fritts Cell 17 7. Hot Press with Cell in Place 21 8. Det...

APPLICATIONS OF SELENIUM CELLS 51 Photometric Applications. Transmission of Speech Over Beams of Light. Automatic Control of Light Buoys and Isolated Lights. As Recorder of Sunl...

TESTING AND MATURING SELENIUM CELLS 32 Two States. Testing and Maturing Set. Accessories for Set. Construction of Rheostat Arm for Wheatstone Bridge. Measurement of Cells by Bri...

THE CONSTRUCTION OF FRITTS SELENIUM CELL 20 Description of Hot Press. Accessories for Press. Other Apparatus Required and Supplies. Preparing Copper Plate. Applying Selenium. Tr...

CONSIDERATION OF CELL TYPES AND THEIR CHARACTERISTICS 5 Factors in Design. Bildwell Cell. Application of Selenium and Annealing. Ruhmer Cell. Bell and Taintor Cell. Mercadier Ce...