A Practical Treatise on Bridge-construction: Being a Text-book on the Design and Construction of Bridges in Iron and Steel. ...

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C. Griffin & Company, 1887 - Bridges - 432 pages
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Page 159 - We can easily produce such a deflection if we apply a certain lateral pressure to the middle of the loaded column ; but the moment we remove that pressure the bow will straighten itself and will lift the incumbent load by reason of the excess of R over P. Also it will be found that as we increase the load P, the smaller will be the amount of lateral pressure required to produce any given deflection. 2nd, If the load P is now increased until it is exactly equal to R, the behaviour of the column will...
Page 216 - ... tons per square inch with an elongation of 20 per cent, in a length of 8 inches, whilst strips cut from it were bent almost double, cold.
Page 243 - ... and in all cases it was found that the original strength of the bar was quite unimpaired, although some of the bars had undergone a far greater number of repetitions than was generally required to produce fracture.1 2d. Another important fact, ascertained beyond question by Wb'hler's experiments, is that a bar may be broken by a still smaller fraction of the static breaking load, if the bar is alternately bent upwards and down1 So far as these early experiments go, they seem to show that iron...
Page v - Xftbograpbic plates, THE object of this book is to describe the modern practice of Bridge-Construction, and to set forth in the simplest language the mechanical principles and experimental facts on which it is based. The design and arrangement of the work have been dictated by a desire to render it as useful as possible, not only to Engineers or Draughtsmen who may be engaged in the work of Bridge-Calculations and Bridge-Construction, , but alsoto students.
Page 373 - In an ordinary spectronometer, if the grazing angle 6, is determined by the position of the reflected beam of X-rays these errors may be either positive or negative, according to the position of the axis of rotation of the crystal with reference to what we have called the effective reflecting plane. Further, they may increase or decrease with the wavelength of the rays, and in limiting cases the size of the crystal would have an effect on them. Our method of using the spectrometer eliminates these...
Page viii - ... materials as they possess, and the most that can be done is to take the experimental facts that have been actually ascertained, and to study their real bearing upon the questions at issue. Throughout the work, I have of course consulted on all occasions the most recent experiments and deductions, and have endeavoured, to the best of my knowledge, to mention in their proper places the authors of recent discoveries or improvements, and to refer to scientific papers which have furnished sources...
Page 176 - ... tons. (2.) For solid pillars with flat ends 44 -16 „ (3.) For hollow pillars with rounded ends 13-0 „ (4.) For hollow pillars with flat ends 44'3 „ II. When the length is less than thirty times the diameter. Let b denote the breaking weight as computed by the above formulae ; and let c denote the crushing load of a short block of the same sectional area assuming a hypothetical strength of forty-nine tons per square inch then...
Page ii - MARINE ENGINEERING; The Designing, Construction, and Working of Marine Machinery. By AE SEATON, MINA Lecturer, Royal Naval College, Greenwich, &c.

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