Because the simple ideas of EDM tools have replaced little because the 3rd version of 1990, there has been little need for major alterations. This variation differs from its predecessor in that it comprises corrections of a couple of mistakes and misprints, absolutely revised tables in Appendices D, E and F and a brand new word in part 2. four. three at the advent of the recent temperature scale in 1990. the writer is indebted to the various readers who suggested the various small blunders and misprints. T. Black, H. Buchanan, R. Da-Col, R. Kochle, P. H. Lam, 1. Nolton, 1. R. Pollard and A. Quade have been fairly useful. All identified mistakes were corrected. the help seasoned vided by way of so much brands (or their brokers) with the updating of the tables with the software info used to be tremendously preferred. Sydney, February 1996 1. M. RUEGER v Preface The booklet has advanced from the author's carrying on with instructing of the topic and from variations of a textual content of an identical identify. the 1st version was once released in 1978 by means of the varsity of Surveying, Universi ty of latest South Wales, Sydney, Australia. Like its predecessors, this absolutely revised 3rd version is designed to make the subject material extra available to scholars continuing to levels in Survey ing and comparable fields.
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