By Kenneth Glyn Jones
This new version of Double stars has been commonly revised. All chapters were rewritten and, as a rule, prolonged. extra extensive assurance has been given to micrometers and micrometric measures. part has been enlarged through greater than one hundred ten units of measures. 100 forty-three extra double and a number of megastar structures were lined, making an new overall of 665. For 2 hundred double and a number of famous person platforms, colours of the parts were made up our minds and are actually given.