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Excerpt from The Diffuse Reflecting Power of Various Substances
Three methods have heretofore been used in determining the amount of energy lost by diffuse reflection from rough surfaces. The first method is based upon the assumption that the diffusion follows the cosine law. The amount of incident energy is measured; also the amount of energy reflected at a given angle from the normal. By integration the total amount is obtained that is lost by diffuse reflection. This method Was used by Angstrom.8 He used a surface bolometer at an angle of and found that for a thickly sooted platinum black surface the reflecting power varied from per cent to per cent, being apparently larger for the short wave lengths. Practically the same method was used by Hutchins.° With a radiomicrometer he investigated the cosine law of diffuse reflection of various substances. He found that the diffusion from rough surfaces of such substances as magnesium oxide and plaster departed an appreciable amount from the cosine law, for large angles, while for paper this departure was very marked for angles between 20° and By integration he found the total amount of energy lost by diffusion.
For a white surface, plaster, using sunlight as a source of energy, the integrated value for the reflecting power (the albedo) was for paper it was and for a green leaf it was which values are in fair agreement with the results of the present research.
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Paperback. Condition: New. Print on Demand. This book comprehensively explores the intriguing world of light energy and its interaction with matter. The author unveils the fascinating science behind the way objects reflect, absorb, and transmit light, delving into the history and ongoing advancements of this field. The book masterfully elucidates the complex relationship between light and materials, examining the fundamental principles that govern their interactions. Through this in-depth analysis, the author sheds light on how the properties of materials can be precisely characterized and manipulated for practical applications. The text illuminates the importance of understanding light's behavior in a wide range of contexts, from the development of optical instruments to the design and optimization of energy-efficient technologies. Ultimately, this book serves as an invaluable resource for scientists, engineers, and anyone seeking to expand their knowledge of the captivating world of light energy. Its meticulous exploration of the subject provides a solid foundation for further research and innovation in this ever-evolving field. This book is a reproduction of an important historical work, digitally reconstructed using state-of-the-art technology to preserve the original format. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in the book. print-on-demand item. Seller Inventory # 9781334256295_0
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