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A Manual of Telegraph Construction; The Mechanical Elements of Electric Telegraph Engineering

A Manual of Telegraph Construction; The Mechanical Elements of Electric Telegraph Engineering


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About the Book

Purchase of this book includes free trial access to www.million-books.com where you can read more than a million books for free. This is an OCR edition with typos. Excerpt from book: PART I. GENERAL PRINCIPLES OF STRENGTH AND STABILITY. CHAPTER I. FORCES, COUPLES, AND WORK. Section I.? Units of force?Forces and Couples considered Statically. 1. Force is an action between two bodies, either causing or tending to cause, change in their relative rest or motion. The direction of a force is that of the motion it tends to produce. Two forces are equal when being applied to the same body in opposite directions, their combined action produces no change in its rest or motion; when two or more forces acting on a body simultaneously produce no such change, the forces are said to be t-n equilibria or balanced. The relations of a force to one of tho bodies between which it acts is made known when three conditions respecting it are given?viz., the point of application or part of the body to which it is applied, the direction of its action, and its magnitude. When motion is not actually produced, but the forces are balanced, they are the subject of Statics; when the motion is actually produced, or its production contemplated, the forces form the subject of DynaMics. Statics and dynamics are abstract mathematical sciences; and therefore, to attain rigidity and simplicity in demonstration, it is necessary to assume conditions which have no existence in fact; thus, bodies are assumed to be absolutely rigid and (unless otherwise stated) to be without weight, cords are assumed to be perfectly flexible and inextensible, and forces are assumed to act on mathematical points and in mathematical lines. As in considering balanced forces velocity and time have not to be considered, statics is simpler than dynamics, and is hence properly considered earlier. The mechanical principles involved in the efficiency and permanence of engineering structures mostly refer to balanced ...


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Product Details
  • ISBN-13: 9780217665254
  • Publisher: General Books
  • Publisher Imprint: General Books
  • Height: 246 mm
  • No of Pages: 178
  • Spine Width: 10 mm
  • Width: 189 mm
  • ISBN-10: 021766525X
  • Publisher Date: 08 Jan 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 327 gr


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