Field Manual for Engineers (Classic Reprint) - Softcover

Inhaltsangabe

Excerpt from Field Manual for Engineers

In Chapter IV the laws of errors in field-work are demonstrated and illustrated; and the best method of conducting a preliminary survey, introduced by the author a generation ago, is explained.

In Chapter V simple and exact formulas for determining the height of a mountain or other object by the dip of the horizon are substituted in place of the approximate formulas in use.

For the stadia, as well as for the telemeter, new formulas are found which require no general computation; and the formula for finding the proper elevation on curves, unlike other formulas, involves no large factors.

In addition to a very general treatment of Compound Curves, Chapter VI includes the location of such curves of any number of branches (pp. 143-5), as well as easy and symmetrical formulas for finding their tangents (p.176).

The reader interested in the philosophy of mathematics will find, it is hoped, an elegant and fruitful illustration of the principles of substitutions in determining general curves to fulfill required conditions on pages 145, 146. This is susceptible of general application. There has also been added a general treatment of the subject of Curves tangent to Curves, including the "Wye Problems"; and also that of Concentric Curves applicable to Parallel Turnouts.

The finding of the angles between the rails at the crossings of curved tracks is also thought to be a valuable addition.

Chapter VII includes a variety of problems in Reversed Curves. The solution of Problems IV, V, and VI were first given to the Senior Class(1869) of the University of Michigan, while the author was in temporary charge.

Chapter VIII treats extensively of Turnouts. The distinction between connecting a straight line and a track, and two tracks, and what is required in each case, is shown on pages 199, 200.

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