hi slashme thanks for the reply especially in form of the corrections already done by you and a third party your difficulties mentioned above should cause me to revise some of the written stuff ideally the writing should give any non physicist a reassuring feeling about the list of instruments that follows while remaining precise for a physicist but again i don't want to promise anything in advance as you can see in other messages i also had some thoughts about the whole article and how it fits into wikipedia by the way i was happy to have hopefully found an answer to the question that i found unanswered in many text books how do they measure entropy