TP.DL 12.01
Transmission line loading code
Transpower New Zealand

PLANE AND SPHERICAL TRIGONOMETRY AND SURVEYING

This edition is intended for teachers, and for them only. The publishers will under no circumstances sell the book except to teachers of Wentworth's Trigonometry ; and every teacher must consider himself in honor bound not to leave his copy where pupils can have access to it, and not to sell his copy except to the publishers, Messrs. Ginn & Company.

It is hoped that young teachers will derive great advantage from studying the systematic arrangement of the work, and that all teachers who are pressed for time will find great relief by not being obliged to work out every problem in the Trigonometry and Surveying.

The Seismicity of Indiana: And its Relationship to Civil Engineering Structures - Phase B

The attached Interim Report on the special research project sponsored by the Indiana State Highway Commission and the Administrative Building Council and titled "The Seismicity of Indiana and Its Relationship to Civil Engineering Structures - Phase B" is submitted as partial fulfillment of the objectives of the Study. Specifically the Report fulfills the requirements of Tasks 1 through 5 of the approved work plan for the Study.

The principal investigator, William D. Kovacs, has experienced time and personnel difficulties in conducting the research. He is also on leave of absence during the present year and until the Fall of 1978. A major investigator, Mr. William J. Murphy, returned to engineering practice before the Study was complete but continued to prepare a report of his work on this study while at Purdue. He and Professor Kovacs are the authors of the attached.

A MANUAL OF UNDERGROUND SURVEYING

Surveying is the art of making measurements which determine the relative position of two or more points. Mine surveying is the art of surveying underground openings, i. e., finding the relative positions of points under the surface, or the position of points underground relative to points upon the surface. The angles and distances measured are usually drawn to scale upon various planes and mine maps thus produced.

In mine surveying there are but few operations different from those of plane surveying. The application of the same principles to the different conditions, along with a greater degree of accuracy, insures success underground.

T. A. 'Donahue, in 'Colliery Surveying,' says: 'Surveying is the art of taking such measurements and observations of an object as will enable a true proportionate representation to be drawn on a plane surface. The principles upon which it depends are all embodied in the science of geometry; so that surveying may be said to be a practical application of geometry.'

Johnson, in his 'Theory and Practice of Surveying,' p. 431, says: 'Surveying is an art, not an exact science.' This should be kept constantly in mind, and in every case that method which promises the minimum deviation from the scientifically correct result should be employed.

Influence of second order effects on the behavior of
transmission line towers

Retaining walls