This historic book may have numerous typos and missing text.
Purchasers can usually download a free scanned copy of the original
book (without typos) from the publisher. Not indexed. Not
illustrated. 1914 edition. Excerpt: ... Chapter IV. A Graphical
Solution for Spans with Supports at Different Levels. The ideal
method for determining the resultant sag and tension under
different loads or temperatures should be conveniently applicable
not only to level supports but also to non-level supports. Hone of
the methods that have been mentioned are conveniently applicable to
the case of non-level supports. Hon-level supports are, however,
not infrequently encountered in a transmission system, and
therefore a more practical method of computation for such cases
becomes desirable. The new method is devised to meet this
requirement and to do away with complex equations and tedious
calculations. In the case of level supports the sag, or deflection,
of a transmission line is measured by the difference in height of
the lowest point of the catenary, the vertex, and the point of
support. With the supports at different heights the vertex lies no
longer in the middle, but moves from the middle towards the lower
support. In this case let the sag be defined as the difference in
elevation of the point of higher support and of the vertex of the
catenary. With non-level supports the calculation of the sag and of
the horizontal distance from the vertex to either point of support
for a given tension, span length, and load is not very simple, as
the solution of the catenary equation must be made by trial.
Moreover, as the temperature and load change, the horizontal
distance of the vertex from the points of support shifts. This adds
to the difficulty of determining the effect of changes in load and
temperature upon the tension and sag. When the tension "T" and load
"W" are given, the laborious calculations involved in a solution
for the sag and the position of the vertex by trial can be...
|Country of origin:
Kuo Tsun Long
||246 x 189 x 1mm (L x W x T)
||Paperback - Trade
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