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acting adopted already applied assumed beam bending bracing breaking bridge calculated cantilever carried central centre chapter column compressive compressive stress consider construction course curve deflection denotes depend depth described determined diagonal diagram diameter direct distributed divided effect elastic ends engine equal evident example experiments expressed feet figure fixed flange flexure foot force formula girder give given greater greatest half horizontal inclined increased intensity joint lateral length less limit load lower material means measured method moments multiple nearly necessary obtained panel parabolic plate position practice pressure produce proportional ratio reference regard represent resistance rivet rolling sectional area shearing shown side span square inch steel straight strain strength stress structure strut supported suppose Table taken tensile tension tons tons per square truss ultimate uniform upper varying vertical weight whole width wrought iron
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 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 ii - HYDRAULIC POWER AND HYDRAULIC MACHINERY. For the Use of Practical Engineers and Students BY PROFESSOR HENRY ROBINSON, CE, FGS.
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...