F. H. Richardson's bluebook of projection (1935)

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NEGATRONS FROM PHOTO-ELECTRIC ELEMENTS Temperature-controlled Emission, page 451 1. Do metals always emit negatrons? 2. What happens to the emission if the metal be heated }/wA&^ 3. Is emission useful when it takes place in air? 4. What is a "space charge"? 5. What is the source of the negatrons emitted by an elec trically-heated wire ? 6. Describe the action of "heater filament." 7. Describe the action of a "cold emitter" tube. Photo-electric Emission, page 453 8. What is a "photo-electric" metal? 9. Name two metals used in photo-electric cells. / 10. Explain the increased emission from metals under the influence of heat. 11. Can the action of light in causing increased emission be explained? . \Ar*% /*) ' ^^u ■ f 450