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The usual tests of dry cells which are made at the present time are arbitrary. They involve the discharge of the cells through resistances for varying periods of time, depending upon the service for which the particular cells are designed. The telephone test, frequently referred to as the A. T. And T. Test, consists of a discharge of 3 cells in series during 4 minutes per hour for 10 consecutive hours a day, but omitting every other discharge period on 1 day of the week. The ignition test for cells which are designed for a heavier type of service involves a discharge of the group of cells for r-hour periods twice each day. The flash light test requires a discharge of the cells for 5 minutes once during 24 hours. The details of these tests may be found in Circular No. 79, Electrical Characteristics and Testing of Dry Cells, published by the Bureau of Standards.
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Automatic Apparatus for Intermittent Testing (Classic Reprint)
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Paperback. Condizione: New. Print on Demand. This book reports on a series of experiments conducted by the U.S. Railroad Administration, Bureau of Standards, and various foundries to investigate the quality of iron used for locomotive cylinder parts. The book reviews relevant literature and previous specifications. It contains the results of mechanical, chemical, and microscopical tests performed on a number of packing rings, arbitration bars, chill-test specimens, and other samples. The tests were conducted to evaluate the influence of chemical composition, manufacturing process, and storage conditions on the strength and wear resistance of cast iron. The author discusses the relationship between laboratory test results and service performance and concludes that the air-furnace process produces iron with better mechanical properties and lower sulfur content than the cupola process. The book provides valuable insights for engineers and manufacturers seeking to improve the quality and performance of cast iron components in locomotive engines. 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. Codice articolo 9781527783706_0
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PAP. Condizione: New. New Book. Shipped from UK. Established seller since 2000. Codice articolo LX-9781527783706
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PAP. Condizione: New. New Book. Shipped from UK. Established seller since 2000. Codice articolo LX-9781527783706
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Condizione: Hervorragend. Zustand: Hervorragend | Seiten: 1024 | Sprache: Englisch | Produktart: Bücher | Keine Beschreibung verfügbar. Codice articolo 30230174/1
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