A Sensitive Instrument for Measuring the Air Permeability of Paper and Other Sheet Materials (Classic Reprint) - Softcover
Synopsis
Excerpt from A Sensitive Instrument for Measuring the Air Permeability of Paper and Other Sheet Materials
The calibration of a set of capillaries by the foregoing method is very tedious and time consuming. As a convenient means of cor roborating the calibration occasionally, and of calibrating replace ment capillaries, the standardizing flow meter shown in figure 7 was made. It is provided with a set of four capillary tubes very similar to those in. The air permeability instrument. These capillaries were calibrated over a somewhat greater range of pressure differences than were the first set. They are kept covered and are never used except for their intended purpose. With this standardizing flow meter connected in place of the gas meter in the calibration train, the capillaries in the air permeability apparatus were again calibrated by this indirect means. The time was, of course, reduced to a small fraction of that required in the calibration by the direct method. The calibrations by the direct and the indirect methods agreed to within about percent except for the largest capillary, for which the agreement was within percent.
In table 1 are shown coefficients for the four capillaries correspond ing to a few values of the pressure difference. The calibration data for the smallest capillary agree very closely with the theoretical flow of a gas through a long capillary tube, but the agreement for the other three capillaries is less and less satisfactory as the capacity of the capillaries increases. If, instead of experimentally standardizing the capillaries, we should adopt the customary procedure (8, 9, 11)
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A Sensitive Instrument for Measuring the Air Permeability of Paper and Other
Print on DemandSeller: Forgotten Books, London, United Kingdom
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Paperback. Condition: New. Print on Demand. This book presents a novel and practical instrument for measuring the air permeability of paper and other sheet materials with remarkable precision. It is a significant advancement compared to existing airflow meters with limited ranges and prone to leakage errors. The book traces the development of the instrument, detailing the author's journey in addressing the shortcomings of available devices. The design process involved overcoming challenges in preventing edge leakage, maintaining constant pressure, and accommodating a wide range of permeabilities. The author introduces the concept of a "double-flow" meter arrangement, which was crucial in achieving precise measurements. The instrument's design also addresses the issue of leakage by employing a unique cell structure that effectively isolates the test area, preventing air movement outside the intended path. The book emphasizes the meticulous attention to detail in constructing the permeability cell and ancillary apparatus. It highlights the significance of calibrating the instrument against known standards to ensure accuracy. The author provides tables for capillary coefficients corresponding to pressure differences, facilitating straightforward calculation of air permeability values. The instrument described in this book has broad applications beyond paper testing. It can measure the permeability of leather, textiles, and various sheet materials. The author explores the potential of the instrument in studying the structure of paper, aging effects, and the behavior of materials under different conditions. This book's insights advance the field of permeability measurement and offer valuable tools for research and quality control. 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 # 9780266010067_0
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A Sensitive Instrument for Measuring the Air Permeability of Paper and Other Sheet Materials (Classic Reprint)
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PAP. Condition: New. New Book. Shipped from UK. Established seller since 2000. Seller Inventory # LX-9780266010067
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A Sensitive Instrument for Measuring the Air Permeability of Paper and Other Sheet Materials (Classic Reprint)
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PAP. Condition: New. New Book. Shipped from UK. Established seller since 2000. Seller Inventory # LX-9780266010067
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