"J. C. Raven first published his Progressive Matrices in the United Kingdom in 1938."

"all entrants to the British armed forces from 1942 onwards took a 20 minute version of the SPM"

edit Just found a copy of and tried the standard test. Very easy once you see what they're testing in each group. Basic pattern matching and boolean shape operations for the most part. Last question was visual arithmetic. According to Wikipedia this only measures the "reasoning" component of Spearman's g. I can honestly admit that my reasoning is pretty questionable, having found myself in numerous questionable situations in my life ;)