gwern comments on Harry Potter and the Methods of Rationality discussion thread, part 9 - Less Wrong
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From context, I got the strong impression that the gadgets came with the office and Dumbledore is speaking about the work of deciphering what each one is measuring. If he was creating that device, why would he speak of the 8 hands as one of 'them', the 'they' that 'came with the Headmaster's office', most of which he has not figured out - except this one which records X...
Um.... No, he didn't create them. It says right in the quote that they came with the office.
Question is.... How did he figure that one out? 'Number of orgasms by left-handed witches in France'; that isn't the kind of data you'd find written down somewhere.
Not in 1993, anyway. You could probably find data to that effect today.