Prehistoric Watering Holes were popular gathering spots millions of years ago where dinosaurs stopped for refreshment before moving on in the vast deserts they populated. Scientists have found several species of dinosaur footprints around prehistoric watering holes leading them to conclude that the animals were happy to have arrived at a watering hole after wandering around dry inhabitable deserts and sand dunes, exhausted from the heat and the blowing sand. They were relieved and pleased to come to a place where there was water.
5*2009 John W Uaman
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THIS book is one of the series of Handbooks on industrial subjects being published by the Popular Mechanics Company. Like Popular Mechanics Magazine, and like the other books in this series, it is written so you can understand it. The purpose of Popular Mechanics Handbooks is to supply a growing demand for high-class, up-to-date and accurate text-books, suitable for home study as well as for class use, on all mechanical subjects. The textand illustrations, in each instance, have been prepared expressly for this series by well known experts, and revised by the editor of Popular Mechanics.