Early photoelectric cell
Wall Art and Photo Gifts from Science Photo Library
Early photoelectric cell
Early photoelectric cell. Photoelectric cells are used to convert light falling on them into electricity. This type of photoelectric cell was developed specifically for early television transmitters. Photoelectric cells make use of an effect whereby metals emit electrons when exposed to light (photo-emissivity). A metal plate of either rubidium, potassium or sodium (the cathode) is enclosed in a vacuum and connected to the negative pole of a battery. A loop of wire (the anode) faces the plate. When exposed to light, electricity crosses the gap between the cathode and anode more easily, enabling the cell to produce impulses of electricity dependent on the intensity of the light falling on it
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Media ID 6441677
© SHEILA TERRY/SCIENCE PHOTO LIBRARY
1900s Communication Communications Device Electric Cell Electronic Electronics History Of Science Nineteenth Century Photoelectricity Telecommunication Telecommunications Television Twentieth Century Physical Televisions
EDITORS COMMENTS
This print showcases an early photoelectric cell, a groundbreaking device that revolutionized the world of television transmission. Developed specifically for early television transmitters, these cells possess the remarkable ability to convert light into electricity. The principle behind their functioning lies in the phenomenon of photo-emissivity, wherein metals emit electrons when exposed to light. In this image, we witness a metal plate made of rubidium, potassium or sodium (known as the cathode) enclosed within a vacuum and connected to the negative pole of a battery. Directly facing the plate is a loop of wire acting as the anode. As light falls upon this ingenious setup, electricity effortlessly crosses the gap between cathode and anode, allowing the cell to generate impulses of electricity proportional to the intensity of incoming light. Dating back to either late 19th or early 20th century technology, this historical artifact represents a pivotal milestone in both physical and technological advancements. Its significance resonates not only in communication and telecommunication fields but also within physics itself. As we delve into its intricate details captured by Science Photo Library's lens, we are transported back in time—witnessing how this single piece of equipment paved the way for future innovations in televisions and electronic devices alike. Let us marvel at its ingenuity while acknowledging its role as one among many building blocks that shaped our modern world through scientific exploration and discovery.
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