tailieunhanh - HOW IT WORKS

How does it work? This question has been put to me so often by persons young and old that I have at last decided to answer it in such a manner that a much larger public than that with which I have personal acquaintance may be able to satisfy themselves as to the principles underlying many of the mechanisms met with in everyday life. In order to include steam, electricity, optics, hydraulics, thermics, light, and a variety of detached mechanisms which cannot be classified under any one of these heads, within the compass of about 450 pages, I have to be content with a comparatively brief treatment. | HOW IT WORKS AUTHOR S NOTE. I beg to thank the following gentlemen and firms for the help they have given me in connection with the letterpress and illustrations of How It Works Messrs. . Pole and . Tweedie for revision of MS. W. Lineham . Kendall E. Edser . Helps J. Limb The Edison Bell Phonograph Co. Messrs. Holmes and Co. The Pelton Wheel Co. Messrs. Babcock and Wilcox Messrs. Siebe Gorman and Co. Messrs. Negretti and Zambra Messrs. Chubb The Yale Lock Co. The Micrometer Engineering Co. Messrs. Marshall and Sons The Maignen Filter Co. Messrs. Broadwood and Co. ON THE FOOTPLATE OF A LOCOMOTIVE. How It Works Dealing in Simple Language with Steam Electricity Light Heat Sound Hydraulics Optics etc. and with their applications to Apparatus in Common Use By ARCHIBALD WILLIAMS Author of The Romance of Modern Invention The Romance of Mining etc. etc. THOMAS NELSON AND SONS London Edinburgh Dublin and New York PREFACE. How does it work This question has been put to me so often by persons young and old that I have at last decided to answer it in such a manner that a much larger public than that with which I have personal acquaintance may be able to satisfy themselves as to the principles underlying many of the mechanisms met with in everyday life. In order to include steam electricity optics hydraulics thermics light and a variety of detached mechanisms which cannot be classified under any one of these heads within the compass of about 450 pages I have to be content with a comparatively brief treatment of each subject. This brevity has in turn compelled me to deal with principles rather than with detailed descriptions of individual devices though in several cases recognized types are examined. The reader will look in vain for accounts of the Yerkes telescope of the latest thing in motor cars and of the largest locomotive. But he will be put in the way of understanding the essential nature of all telescopes motors and steam-engines so far as they are at .

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