Let's start by giving an example of using Google as a search engine, using the keywords transmission lines sagging. Before we check these results, ask this question: what are the critieria that Google used to rank these results? Please note that this search was performed on Sept. 18th, 2014 so you might get different results if you use the same search keywords.
Google identified 108,000 results and the first results are shown. You need to look at the results of a google search and remember that they may not be the best resources you can get for your research, and that the order of results could be biased toward specific sources or commercial products.