Open Day at CSIRO's National Measurement Laboratory.Pic Shows: Mr David Brown, senior scientist with the high voltage lab, explains to students from Oakhill College, Castle Hill the operations of a high voltage isolator used to test isolating or cut-off s

Open Day at CSIRO's National Measurement Laboratory.Pic Shows: Mr David Brown, senior scientist with the high voltage lab, explains to students from Oakhill College, Castle Hill the operations of a high voltage isolator used to test isolating or cut-off switched before they are instulled in power lines.About 200 of Sydney top High School students today took advantage of open day at the CSIRO's National Measurement Laboratory, West Lindfield with a tour of the $27 million lab and to talk to top scientists. April 15, 1980. (Photo by Alan Gilbert Purcell/Fairfax Media via Getty Images).