Compressed Air

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Excerpt from Compressed Air: Theory and Computations After five years trying-out of the first edition the second has been prepared with the view to eliminate all errors and ambiguities and to add matter of value where possible without burdening the text with illustrations and descriptions of matter of only temporary value, such as machines and devices that are in use today but may be succeeded by better ones in a few years. It is the author's opinion that current practice, in the general form of machines and their details, can best be studied in trade circulars, of which there are many very creditable productions illustrating and describing a greater variety of machines than can possibly be shown in a text-book. A new chapter has been added on centrifugal fans and turbine compressors. The author has found a need for a clear, concise presentation of the theory underlying such machines, and believes that a more general knowledge of the technicalities of the subject will lead to material betterment of the cheaper forms of fans that make up the greater portion of the total in use. Appendix B, on design of Logarithmic charts, should be welcome to most students since such matter has not appeared in textbooks in common use. Compressed air has long held the Held for rock drilling underground, though electricity has several times attempted to get into that business. At one time it seemed that compressed air would prove the best motive power for underground pumps, but in more recent years the improvements in centrifugal pumps seem to give electricity the advantage. In general, it may be assumed that where rotation is desired electricity will have the advantage, while where rapid reciprocating motion is desired air will have the advantage. In the latter class are all kinds of pneumatic hammers, which have revolutionized several industries since they have been introduced. It is not the intention to enumerate here the applications of compressed air. It is a very versatile, willing and good-natured servant. It offers a fascinating field for the inventor and its usefulness and already numerous applications will surely increase. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully, any imperfections that remain are intentionally left to preserve the state of such historical works.