These vials, common on most ordinary levels today, have a slightly curved glass tube which is incompletely filled with a liquid, usually a colored spirit or alcohol, leaving a bubble in the tube.
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His second book, The Spirit Level Delusion: Fact-checking the Left's New Theory of Everything (2010), is a response to and critique of The Spirit Level: Why More Equal Societies Almost Always Do Better.
Peter Robert Saunders, Professor Emeritus of Sociology at Sussex University, published a report for the think tank Policy Exchange questioning the statistics in The Spirit Level.